diff --git a/src/window/vram/bgmap.rs b/src/window/vram/bgmap.rs
index 47fa87e..3b0f39f 100644
--- a/src/window/vram/bgmap.rs
+++ b/src/window/vram/bgmap.rs
@@ -40,7 +40,7 @@ impl BgMapWindow {
             sim_id,
             loader: Arc::new(loader),
             memory: memory.clone(),
-            bgmaps: memory.watch(sim_id, 0x00020000, 0x1d800),
+            bgmaps: memory.watch(sim_id, 0x00020000, 0x20000),
             cell_index: params.cell_index,
             generic_palette: params.generic_palette,
             params,
@@ -62,7 +62,7 @@ impl BgMapWindow {
                         });
                         row.col(|ui| {
                             let mut bgmap_index = self.cell_index / 4096;
-                            ui.add(NumberEdit::new(&mut bgmap_index).range(0..14));
+                            ui.add(NumberEdit::new(&mut bgmap_index).range(0..16));
                             if bgmap_index != self.cell_index / 4096 {
                                 self.cell_index = (bgmap_index * 4096) + (self.cell_index % 4096);
                             }
@@ -227,7 +227,7 @@ impl BgMapRenderer {
     pub fn new(sim_id: SimId, memory: &MemoryClient) -> Self {
         Self {
             chardata: memory.watch(sim_id, 0x00078000, 0x8000),
-            bgmaps: memory.watch(sim_id, 0x00020000, 0x1d800),
+            bgmaps: memory.watch(sim_id, 0x00020000, 0x20000),
             brightness: memory.watch(sim_id, 0x0005f824, 8),
             palettes: memory.watch(sim_id, 0x0005f860, 16),
         }
diff --git a/src/window/vram/utils.rs b/src/window/vram/utils.rs
index 9cbfd4f..98154da 100644
--- a/src/window/vram/utils.rs
+++ b/src/window/vram/utils.rs
@@ -134,6 +134,12 @@ pub fn read_char_row(
     })
 }
 
+pub fn read_char_pixel(char: &[u16; 8], hflip: bool, vflip: bool, row: usize, col: usize) -> u8 {
+    let pixels = if vflip { char[7 - row] } else { char[row] };
+    let pixel = if hflip { 7 - col } else { col } << 1;
+    ((pixels >> pixel) & 0x3) as u8
+}
+
 pub struct CharacterGrid<'a> {
     source: ImageSource<'a>,
     scale: f32,
diff --git a/src/window/vram/world.rs b/src/window/vram/world.rs
index 6bf78e6..18803cf 100644
--- a/src/window/vram/world.rs
+++ b/src/window/vram/world.rs
@@ -1,8 +1,8 @@
 use std::{fmt::Display, sync::Arc};
 
 use egui::{
-    CentralPanel, Checkbox, Color32, ComboBox, Context, Image, ScrollArea, Slider, TextureOptions,
-    Ui, ViewportBuilder, ViewportId,
+    Align, CentralPanel, Checkbox, Color32, ComboBox, Context, Image, ScrollArea, Slider, TextEdit,
+    TextureOptions, Ui, ViewportBuilder, ViewportId,
 };
 use egui_extras::{Column, Size, StripBuilder, TableBuilder};
 use num_derive::{FromPrimitive, ToPrimitive};
@@ -10,7 +10,7 @@ use num_traits::FromPrimitive;
 
 use crate::{
     emulator::SimId,
-    memory::{MemoryClient, MemoryView},
+    memory::{MemoryClient, MemoryRef, MemoryView},
     vram::{VramImage, VramParams, VramProcessor, VramRenderer, VramTextureLoader},
     window::{
         utils::{NumberEdit, UiExt as _},
@@ -18,7 +18,7 @@ use crate::{
     },
 };
 
-use super::utils::{self, shade, Object};
+use super::utils::{self, shade, CellData, Object};
 
 pub struct WorldWindow {
     sim_id: SimId,
@@ -67,6 +67,19 @@ impl WorldWindow {
                             ui.add(NumberEdit::new(&mut self.index).range(0..32));
                         });
                     });
+                    body.row(row_height, |mut row| {
+                        row.col(|ui| {
+                            ui.label("Address");
+                        });
+                        row.col(|ui| {
+                            let address = 0x3d800 + self.index * 32;
+                            let mut address_str = format!("{address:08x}");
+                            ui.add_enabled(
+                                false,
+                                TextEdit::singleline(&mut address_str).horizontal_align(Align::Max),
+                            );
+                        });
+                    });
                 });
             let data = {
                 let worlds = self.worlds.borrow();
@@ -78,6 +91,118 @@ impl WorldWindow {
                     .column(Column::remainder())
                     .column(Column::remainder())
                     .body(|mut body| {
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Map base");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.header.base).range(0..16));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("BG width");
+                            });
+                            row.col(|ui| {
+                                let widths = ["1", "2", "4", "8"];
+                                ComboBox::from_id_salt("width")
+                                    .selected_text(widths[world.header.scx as usize])
+                                    .width(ui.available_width())
+                                    .show_ui(ui, |ui| {
+                                        for (value, label) in widths.into_iter().enumerate() {
+                                            ui.selectable_value(
+                                                &mut world.header.scx,
+                                                value as u32,
+                                                label,
+                                            );
+                                        }
+                                    });
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("BG height");
+                            });
+                            row.col(|ui| {
+                                let heights = ["1", "2", "4", "8"];
+                                ComboBox::from_id_salt("height")
+                                    .selected_text(heights[world.header.scy as usize])
+                                    .width(ui.available_width())
+                                    .show_ui(ui, |ui| {
+                                        for (value, label) in heights.into_iter().enumerate() {
+                                            ui.selectable_value(
+                                                &mut world.header.scy,
+                                                value as u32,
+                                                label,
+                                            );
+                                        }
+                                    });
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Dest X");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.dst_x).range(-512..512));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Dest Y");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.dst_y));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Dest parallax");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.dst_parallax).range(-512..512));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Src X");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.src_x).range(-4096..4096));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Src Y");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.src_y).range(-16384..16384));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Src parallax");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.src_parallax).range(-4096..4096));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Width");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.width).range(-4096..4096));
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Height");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.height));
+                            });
+                        });
                         body.row(row_height, |mut row| {
                             row.col(|ui| {
                                 ui.label("Mode");
@@ -97,6 +222,28 @@ impl WorldWindow {
                                     });
                             });
                         });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Params");
+                            });
+                            row.col(|ui| {
+                                let address = 0x00020000 + world.param_base * 2;
+                                let mut address_str = format!("{address:08x}");
+                                ui.add_enabled(
+                                    false,
+                                    TextEdit::singleline(&mut address_str)
+                                        .horizontal_align(Align::Max),
+                                );
+                            });
+                        });
+                        body.row(row_height, |mut row| {
+                            row.col(|ui| {
+                                ui.label("Overplane");
+                            });
+                            row.col(|ui| {
+                                ui.add(NumberEdit::new(&mut world.overplane).range(0..65536));
+                            });
+                        });
                         body.row(row_height, |mut row| {
                             row.col(|ui| {
                                 ui.add(Checkbox::new(&mut world.header.lon, "Left"));
@@ -154,7 +301,7 @@ impl AppWindow for WorldWindow {
     fn initial_viewport(&self) -> ViewportBuilder {
         ViewportBuilder::default()
             .with_title(format!("Worlds ({})", self.sim_id))
-            .with_inner_size((640.0, 480.0))
+            .with_inner_size((640.0, 500.0))
     }
 
     fn on_init(&mut self, ctx: &Context, _render_state: &egui_wgpu::RenderState) {
@@ -190,6 +337,7 @@ struct WorldParams {
 
 struct WorldRenderer {
     chardata: MemoryView,
+    bgmaps: MemoryView,
     objects: MemoryView,
     worlds: MemoryView,
     brightness: MemoryView,
@@ -204,6 +352,7 @@ impl WorldRenderer {
     pub fn new(sim_id: SimId, memory: &MemoryClient) -> Self {
         Self {
             chardata: memory.watch(sim_id, 0x00078000, 0x8000),
+            bgmaps: memory.watch(sim_id, 0x00020000, 0x20000),
             objects: memory.watch(sim_id, 0x0003e000, 0x2000),
             worlds: memory.watch(sim_id, 0x0003d800, 0x400),
             brightness: memory.watch(sim_id, 0x0005f824, 8),
@@ -313,6 +462,86 @@ impl WorldRenderer {
             )
         }
     }
+
+    fn render_world(&mut self, world: World, params: &WorldParams, image: &mut VramImage) {
+        image.clear();
+
+        let height = if world.header.mode == WorldMode::Affine {
+            world.height.max(8)
+        } else {
+            world.height
+        };
+
+        let dx1 = world.dst_x;
+        let dx2 = dx1 + world.width;
+        if dx1 - world.dst_parallax > 384 || dx2 + world.dst_parallax < 0 {
+            return;
+        }
+        let dy1 = world.dst_y;
+        let dy2 = dy1 + height;
+        if dy1 > 224 || dy2 < 0 {
+            return;
+        }
+
+        let colors = if params.generic_palette {
+            [
+                utils::generic_palette(params.left_color),
+                utils::generic_palette(params.right_color),
+            ]
+        } else {
+            let brts = self.brightness.borrow().read::<[u8; 8]>(0);
+            let shades = utils::parse_shades(&brts);
+            [
+                shades.map(|s| shade(s, params.left_color)),
+                shades.map(|s| shade(s, params.right_color)),
+            ]
+        };
+
+        let mut chars = CharCache::new(self.chardata.borrow());
+        let mut cells = CellCache::new(self.bgmaps.borrow());
+
+        for y in 0..height {
+            let dy = y + world.dst_y;
+            if !(0..224).contains(&dy) {
+                continue;
+            }
+            let sy = y + world.src_y;
+
+            // left side
+            for x in 0..world.width {
+                let dx = x + world.dst_x - world.dst_parallax;
+                if !(0..384).contains(&dx) {
+                    continue;
+                }
+                let sx = x + world.src_x - world.src_parallax;
+
+                let cell_index = world.source_cell(sx, sy);
+                let cell = cells.get(cell_index);
+                let char = chars.get(cell.char_index);
+                let row = (sy & 0x7) as usize;
+                let col = (sx & 0x7) as usize;
+                let pixel = utils::read_char_pixel(char, cell.hflip, cell.vflip, row, col);
+                image.add((dx as usize, dy as usize), colors[0][pixel as usize]);
+            }
+
+            // right side
+            for x in 0..world.width {
+                let dx = x + world.dst_x + world.dst_parallax;
+                if !(0..384).contains(&dx) {
+                    continue;
+                }
+                let sx = x + world.src_x + world.src_parallax;
+
+                let cell_index = world.source_cell(sx, sy);
+                let cell = cells.get(cell_index);
+                let char = chars.get(cell.char_index);
+                let row = (sy & 0x7) as usize;
+                let col = (sx & 0x7) as usize;
+                let pixel = utils::read_char_pixel(char, cell.hflip, cell.vflip, row, col);
+                image.add((dx as usize, dy as usize), colors[1][pixel as usize]);
+            }
+        }
+    }
 }
 
 impl VramRenderer<1> for WorldRenderer {
@@ -342,28 +571,77 @@ impl VramRenderer<1> for WorldRenderer {
             }
             drop(worlds);
             self.render_object_world(group, params, image);
+        } else {
+            let world = World::parse(&worlds.read(params.index));
+            drop(worlds);
+            self.render_world(world, params, image);
         }
     }
 }
 
 struct World {
     header: WorldHeader,
+    dst_x: i16,
+    dst_parallax: i16,
+    dst_y: i16,
+    src_x: i16,
+    src_parallax: i16,
+    src_y: i16,
+    width: i16,
+    height: i16,
+    param_base: usize,
+    overplane: usize,
 }
 
 impl World {
     pub fn parse(data: &[u16; 16]) -> Self {
         Self {
             header: WorldHeader::parse(data[0]),
+            dst_x: (data[1] as i16) << 6 >> 6,
+            dst_parallax: (data[2] as i16) << 6 >> 6,
+            dst_y: data[3] as i16,
+            src_x: (data[4] as i16) << 3 >> 3,
+            src_parallax: (data[5] as i16) << 1 >> 1,
+            src_y: (data[6] as i16) << 3 >> 3,
+            width: 1 + ((data[7] as i16) << 3 >> 3),
+            height: 1 + data[8] as i16,
+            param_base: data[9] as usize,
+            overplane: data[10] as usize,
         }
     }
+
+    fn source_cell(&self, sx: i16, sy: i16) -> usize {
+        if self.header.over {
+            let bg_width = 1 << self.header.scx << 9;
+            let bg_height = 1 << self.header.scy << 9;
+            if !(0..bg_width).contains(&sx) || !(0..bg_height).contains(&sy) {
+                return self.overplane;
+            }
+        }
+
+        let scx = 1 << self.header.scx.min(3 - self.header.scy);
+        let scy = 1 << self.header.scy;
+        let map_x = ((sx >> 9) & (scx - 1)) as usize;
+        let map_y = ((sy >> 9) & (scy - 1)) as usize;
+        let map_index = self.header.base + (map_y * scx as usize) + map_x;
+
+        let cell_x = (sx >> 3) as usize & 0x3f;
+        let cell_y = (sy >> 3) as usize & 0x3f;
+        let cell_index = (cell_y * 64) + cell_x;
+
+        (map_index << 12) + cell_index
+    }
 }
 
 struct WorldHeader {
     lon: bool,
     ron: bool,
     mode: WorldMode,
+    scx: u32,
+    scy: u32,
     over: bool,
     end: bool,
+    base: usize,
 }
 
 impl WorldHeader {
@@ -371,14 +649,20 @@ impl WorldHeader {
         let lon = data & 0x8000 != 0;
         let ron = data & 0x4000 != 0;
         let mode = WorldMode::from_u16((data >> 12) & 0x3).unwrap();
+        let scx = (data >> 10) as u32 & 0x03;
+        let scy = (data >> 10) as u32 & 0x03;
         let over = data & 0x0080 != 0;
         let end = data & 0x0040 != 0;
+        let base = (data & 0x000f) as usize;
         Self {
             lon,
             ron,
             mode,
+            scx,
+            scy,
             over,
             end,
+            base,
         }
     }
 }
@@ -407,3 +691,52 @@ impl Display for WorldMode {
         })
     }
 }
+
+struct CellCache<'a> {
+    bgmaps: MemoryRef<'a>,
+    index: usize,
+    cell: CellData,
+}
+
+impl<'a> CellCache<'a> {
+    fn new(bgmaps: MemoryRef<'a>) -> Self {
+        Self {
+            bgmaps,
+            index: 0x10000,
+            cell: CellData::parse(0),
+        }
+    }
+
+    fn get(&mut self, index: usize) -> &CellData {
+        if self.index != index {
+            let data = self.bgmaps.read(index);
+            self.cell = CellData::parse(data);
+            self.index = index;
+        }
+        &self.cell
+    }
+}
+
+struct CharCache<'a> {
+    chardata: MemoryRef<'a>,
+    index: usize,
+    char: [u16; 8],
+}
+
+impl<'a> CharCache<'a> {
+    fn new(chardata: MemoryRef<'a>) -> Self {
+        Self {
+            chardata,
+            index: 2048,
+            char: [0; 8],
+        }
+    }
+
+    fn get(&mut self, index: usize) -> &[u16; 8] {
+        if self.index != index {
+            self.char = self.chardata.read(index);
+            self.index = index;
+        }
+        &self.char
+    }
+}