Easy
Medium
Hard
Deadly
Auto
Light
Dark
hard puzzles
e^Pi or Pi^e
Colored Runs of Cards
Drunk Ant
Distance from North Pole
Expected Breakup Length
Messing with Envelops
Collecting Lucky coupons
The Noodles
Distinct Number Draws
Greed for an ACE
Random point on disk
Enclosing The Center
Sum To One
Random Walk
Left Some Candies
Catching the Submarine
Catching the Spy
Pure Gold
Counter Strike
Sharing a Secret
Weights Reckoning
Gas Stations on Circular Trek
Bricking Box
Consecutive sums
Intersecting Pillars
Color Switches