jannie1: I tried it more then 15 times but I can't cross the bridge, because I'd no luck to kill the rat in the right moment.
Any hints?
Thx!
This is a particularly notorious puzzle of the game (another one is Moraji's sequence in Act 2).
Hints (sorry there are no spoiler tags so I'll try to give gradual hints):
1. The bridge is rickety and cannot withstand the weight of a rat and McCoy.
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2. Don't kill the rat while it is on the bridge.
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3. You can wait / lure the rat to advance so that it crosses the entire bridge to McCoy's end (left side of the screen).
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4. McCoy can walk down to the left side of the bridge and wait there.
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5. Kill the rat when it has completely crossed the bridge, while McCoy is waiting in the left side beside the bridge at a safe distance from the rat . Alternatively, you could kill the rat while it's on the right side
but not if it's on the bridge. And if I recall correctly, there was an original bug that we may have left unfixed, whereby if you leave the screen by walking to the left exit and return, there is a high chance that the rat won't show up this time.