Grimace's Birthday is an unlicensed Game Boy Color game that was commissioned by the McDonald's Corporation as part of their 2023 promotional event of celebrating one of their mascots' birthday. It is a short platformer that has skateboarding levels as a throwback to late-1990s pop culture and regular platforming levels. The story in the game has Grimace gathering a number of other McDonald's mascots for his birthday so they can watch him blow out the candles on his birthday cake. However, the candles have already been lit, so he must get all of his friends before the candles go out.

Cephla here does just that and gets Birdie, the Hamburglar, and the McNugget Buddies to celebrate Grimace's birthday in record time.