Manic Miner is a platform game originally written for the ZX Spectrum by Matthew Smith and released by Bug-Byte in 1983. It is the first game in the Miner Willy series and among the early titles in the platform game genre. It has sequel Jet Set Willy.
In 1985 the game was re-released by Software Projects. That time impossible triangles appeared in the game. Below, you can see screenshot from the game of 1983 and from latter release with impossible triangles.