Wanderer (GitHub) is a Boulder Dash (1984) like game, originally written in K&R C — now C99 — for UNIX and released on Usenet comp.source.games in 1988. Later, it was ported to different systems, MS-DOS, Atari, Amiga, BBC Micro, and SCO-Unix. Some even in graphics mode.
Wanderer
To clear a level (screen) is to collect all the diamonds, stay alive, then head out through the WAYOUT.