GB Studio maxima & minima at a glance.

GB Studio Numbers Cheat Sheet.md

GB Studio Numbers Cheat Sheet

Certain values relevant to GB Studio development! Updated to reflect GB Studio version 4.x.

Information compiled by 2BitCrook.

Pixel Counts

• 8 x 8 The size of a background tile.

• 8 x 16 The size of a sprite tile.

• 16 x 16 Two sprite tiles, a metasprite.

• 160 x 144 The base resolution for the GB and smallest size for a scene.

• 512 x 2040 Maximum size for a tall, narrow scene.

• 2040 x 512 Maximum size for a wide, short scene.

• 1016 x 1016 Maximum size for a square scene.

• 1016 x 1024 Maximum size for an almost-square scene.

Tile Counts

• DMG (GBC)

• 52 (116) Max Background Tiles used as text characters before getting overwritten.

• 128 (256) Max Background Tiles in a scene to be able to have 96 sprite tiles available.

• 192 (384) Max Background Tiles in a scene and still be able to use dialog/text. 64 sprite tiles available.

• 256 (512) Max Background Tiles in a scene that isn't logo mode. 64 sprite tiles available.

• 360 (360) Amount of tiles that make up a 160x144 resolution. All tiles can be unique in logo mode. 12 sprite tiles available.

• 20 (20) Background Tiles per row (X).

• 18 (18) Background Tiles per column (Y).

• 10 Max Sprite Tiles per row (scanline).

• 40 Max Sprite Tiles on screen at once.

  • Metasprites can be composed at maximum by this number of sprites.

• 96 Max Sprite Tiles in a scene total.

Colour Counts

• 4 Colours per GBC palette.
  • All 4 are used for Backgrounds Tiles (including text and UI).
  • Only 3 are used for Sprite Tiles.
• 16 GBC palettes total
  • 8 used for Background Tiles, with the 8th palette used for text and UI.
  • 8 used for Sprite Tiles.

Colour Codes

• #071821 Darkest tone for sprites and backgrounds.
• #306850 Mid dark tone for backgrounds only.
• #86c06c Mid light tone for sprites and backgrounds.
• #e0f8cf Lightest tone for sprites and backgrounds
• #65ff00 Transparency for sprites.
• #ff00ff Transparency for variable width font glyphs.

Variable Counts

• 768 Total variables.
  • 512 globals.
  • 256 shared between locals and script parameters.

Variable Values

• +32767 Max variable value.

• -32768 Min variable value.

• 0 is treated as false.

• Any other values is treated as true.

Byte Counts

• 3 Scene Pointer
• 13 Camera Struct
• 76 Event Block Struct
• 23 Music Struct
• 349 Projectile Struct
• 1185 Actor Struct
• 313 VM Script Context
• 5325 Default Save Slot
• 8192 SRAM Bank

Other Counts

• 5 Unique projectiles per scene.
• 10 Active actors can be on screen at once.
• 20 Active actors in a large scene.
• 0.0625 Minimum movement speed.
• 7.9375 Maximum movement speed.