GameMaker Studio 2 (.yy)

The GameMaker exporter writes a room file (.yy) in the GMRoom format. Drop it into a GameMaker Studio 2 project (rooms folder) and it loads with the layers intact.

What's covered

• Tile layers as GMRTileLayer (one per GridCraft tile layer).
• Object layers as GMRInstanceLayer with one instance per object.
• Image layers as GMRBackgroundLayer.
• Group layers as GMRLayer groups.
• Flip horizontal, flip vertical, and 90-degree rotation per tile.

Tile encoding

GameMaker stores tiles as 32-bit values with flag bits in the high nibble:

0x80000000  uninitialised / empty
0x10000000  flipped horizontally
0x20000000  flipped vertically
0x40000000  rotated 90 degrees

The exporter translates Tiled flip-bit conventions into the GameMaker layout above.

What gets lost

• Tile animations (GameMaker uses sprite-frame animation, not tile animation).
• Variable-size tiles. The anchor exports as 1x1.
• Wang sets, AutoMap rules, polygon collision.

Output

map.yy   (GameMaker Studio 2 room file)