Wikipedia lists it as the following:

Sim Brick is a parody of the popular Sim series of computer games. It was a computer game written in 1991 by Sensible Software and included with Amiga Power issue 13.[1]
The game is designed to simulate a brick. There are four options:
  • Exist (if the brick does not already exist, it is called into existence)
  • Info (displays a schematic of the brick)
  • Pause (pauses the game)
  • Quit (quits the game)
The game also features an ant, which always meets an untimely and bloody death when the brick is called into existence, because the brick always spawns in mid-air and crushes it.