- Who
- Jim Bagley
- Where
- United Kingdom (Merseyside)
- When
The largest videogame ported to the Sinclair ZX81 is Dragon's Lair at 15,824,610 bytes, achieved by Jim Bagley (UK), in Merseyside, UK on 30 April 2015.
Dragon's Lair is a retro classic arcade laser disc game, where it plays a movie of Dirk the Daring rescuing princess Daphne from a dragon.