There's been a few fan-translated videogames to Esperanto (meaning you need to find the ROM or patch file):

Castlevania II - Simon's Quest - translated by NESperanto
Final Fantasy (1990-05) - by NESperanto
Zelda II - The Adventures of Link (1988) - by eokakto

I personally am (very) slowly working on translating "Pokemon Green" for the GBC from Japanese to Esperanto.