Riddles, one at a time
One Piece Fits
Pieces may turn but never flip over. Which piece fills the hole?
Video · Medium
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PIECE C
Turn C a quarter turn: it drops right in.
How Many Routes: 2 × 2 Grid
Moving only right or up, how many different routes lead from start to the gem?
Each corner's count is the count to its left plus the count below it.
Video · Medium
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6
Add the ways from the left and from below: 3 + 3 = 6.
Twelve Glowing Dots
How many squares can you make by joining 4 dots?
Don't forget squares standing on a corner.
Picture · Genius
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11
5 upright squares and 6 tilted ones.
Follow the Light
Colours mix like paint. Which door does the beam light, and in what colour?
Video · Hard
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D, ORANGE
Mirrors turn it; red and yellow panes make orange.
The Lamp and the Wall
Which shadow appears on the wall?
Video · Medium
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C
Each row's tallest stack sets the shadow.