Despite being ported to numerous platforms, Mountain King isn't considered the classic I think it perhaps should be. A lot of people don't seem to remember it. But rather than try to write about it myself, I'll let others do it and do it better. Please read this and this, then come back.
I will say the animation makes a difference in gameplay. The original Atari 8-bit and 5200 versions are much smoother than the 2600 and ColecoVision conversions done by VSS.
The 2600 version contains something referred to as "Glitch Heaven," a glitchy "hidden level" up in the sky. Ed Salvo of VSS: "The secret level in Mountain King was a feature of the 800 game and I duplicated it." However, the 8-bit/5200 versions do not have a "Glitch Heaven;" they have a "Glitch Hell" (see video below).
Mountain King was originally written by Bob Matson. Jess Ragan (author of one of the posts above) e-mailed him and managed to get a response, which you can read here. Matson now works at Michigan State University.
Available for Atari 8-bit computers, Atari 5200, Atari 2600, ColecoVision, Commodore 64, and VIC-20
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