This is a game commissioned by McDonald's in order to promote one of their mascots, Grimace.

This in itself isn't a Flash game. Although it was designed to look like a retro game, that's because it actually is a Gameboy Color game. Using a modified version of NESBox, I can inject any ROM file I wish into it and it will run it. You can extract the ROM using something like ffDec (or just download it from the original website) and play it on real hardware through a flash cart or an emulator of your choice.

Grimace's Birthday.swf (428.7 KiB) 480x432, Compressed (Deflate). 2 frames, 60 fps (00:00). Ver10, AS3. Network access: Yes. Text: No. Bitmaps: No. Audio: No. Video: No. <METADATA> [find in archive]