Pharaoh's Tomb

It's a classic! Apogee Software (who went on to publish Commander Keen, Duke Nukem, and many other famous games) published Pharaoh's Tomb first. It's a platform/puzzle game that's low on action and high on tricky jumps and movements. Clearly some influence from games like Montezuma's Revenge and Rick Dangerous. It admittedly has poor CGA graphics and annoying PC speaker sound effects and one-hit deaths ... but it's still cool as a classic platform jumping game. The full version of this game game has been released for free.