Frak!

Frak! is a side scrolling platform game in which the player controls a caveman named Trogg. In each level, Trogg's object is to find three keys located on the level. The platforms and ladders (replaced by logs, ropes and chains on later levels) constituting the level are laid out in a very tricky form. When Trogg steps off a platform, he does not fall straight down, but instead slides diagonally downwards. Added to the fact that long falls will kill Trogg, this calls for very skillful jumping among the platforms. Trogg exclaims "Frak!" (presumably an expletive) each time he dies. When the user manages to complete the three levels, they are returned to the first level with the screen display upside down. The game then repeats the same three stage sequence, following which it rotates 90 degrees and repeats again. Subsequent loops consist of video being displayed in black and white and rotated, and also the display being flashed on and off in three second intervals.

Source: Wikipedia, "Frak!", available under the CC-BY-SA License.