Two Guards, One Question★☆☆about 4 min
Twelve Coins, Three Weighings★★★about 8 min
The Missing Dollar★☆☆about 4 min
Three Switches, One Bulb★★☆about 5 min
Three People, Five Hats★★★about 8 min
Checking the Four Cards★★★about 6 min
Three Doors and a Detective★★☆about 5 min
Thirteen People, Same Birth Month★☆☆about 3 min
Three Things Across the River★☆☆about 5 min
Two Taps and a Tank★☆☆about 4 min
The Twenty-Minute Head Start★★☆about 5 min
Across the Round Table★☆☆about 3 min
Forty-Five Minutes from Two Ropes★★★about 8 min
Nine Minutes from Two Hourglasses★★☆about 6 min
Twenty-Three People★★☆about 5 min
Counting Coins by Remainders★★☆about 6 min
The Magic Square Lock★☆☆about 4 min
Socks in the Dark★☆☆about 3 min
Three Cuts Through a Cake★★☆about 5 min
What Day Is the Thirteenth?★★☆about 4 min
Four Statements, One Culprit★★★about 10 min