Countdown (aka Countdown UXB) for the Commodore VIC-20 / Commodore VC-20

Came also out for:

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Game description:

A mad scientist has planted a bomb in a sewer! You are trapped in his house and you have to escape it, get through a jungle collecting keys to open the sewer and finally get down to the sewer, also collecting keys - but this time to defuse the bomb.

The bomb will explode in a certain period of time, which the player can set at the beginning. 2 minutes, 2 minutes and 30 seconds, or 3 minutes.

In each level there are bonuses for the player to collect. Collecting these will award the player with extra points.

After the bomb is defused the game will start in the first level, the house level, again.

Should the player not defuse the bomb in time the game will be over and the player can write his name for the high-score list.

[Emulous]

Doesn't look half bad. There is a game called UXB - The Unexploded Bomb on the C64 but its a buggy Jet Set Willy clone.