Buy CAPX: scirra.com/store/games-with-source/keystone-catch-the-thief-1090
Inspired by Keystone Kapers is a 1983 game published by Activision for the Atari 2600.
In this game, Officer Kelly and Harry are in a four story department store. Each round Kelly starts out at the first floor entrance at the lower right hand corner of the screen, while Harry starts out at the second floor elevator door. When the 50 second countdown begins, Kelly will run to the left, toward the elevators at the center of the store. The player controlling Kelly has to catch Harry before the countdown ends and before Harry can escape off the roof of the store. Each time Kelly succeeds or fails, the round ends and a new round begins if Kelly manages to catch the thief or at the expense of one extra life. Extra lives are awarded every 50,000 points; however, the maximum number of lives that can be held in reserve is three. The game is over once all of Kelly's lives are lost.