END TO END: Predict how long it will take to get from one end of the tunnel to the other, then have someone time you to test your guess.
TUNNEL TO ADVENTURE: Pretend the tunnel leads to a magical kingdom, a deserted island, or a different planet!
READY OR NOT . . . Hide and Seek! Have the seeker hide in the tunnel to count, then have the tunnel be home base for the hiders!
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