Karl's Treasure Hunt (UK) (1984) - Amstrad CPC - Puzzle, Adventure.

Karl ? after his last outing in Karl's Cavern (which was only released for the BBC Micro) ? has fallen on hard times. So imagine his delight when he wins a competition for a stay in Wonga Mansion. "So what?" you say. Well, scattered around this mansion's 40 rooms are 40 keys. If Karl can collect all of the keys and then locate the exit, he can unlock the treasure chest and become rich beyond his wildest dreams!