Riddles, one at a time

Three chests: gold, silver and bronze. The treasure is in one of them. Exactly one of these labels is true. Gold: 'The treasure is in here.' Silver: 'The treasure is not in here.' Bronze: 'The treasure is not in the gold chest.' Which chest holds the treasure?

Three Chests

Text · Hard Challenge link
Answer

SILVER

If it were in gold or bronze, two labels would be true. Only silver leaves exactly one true label (bronze's).

Full explanation on the blog

Count Every Cube

How many cubes are in the stack?

Video · Expert Challenge link
Answer

27

Column heights, row by row: 4+3+3+1 = 11, 3+3+2+1 = 9, 2+2+1 = 5, 1+1 = 2. Total 27, hidden cubes included.

Square, Circle, X

How many closed areas can you count?

Video · Hard Challenge link
Answer

12

4 slices inside the circle, and each corner is cut in two: 4 + 8 = 12.

Flip-Flop Gates

Gates start as shown and flip after each box. Where does box 3 land?

Video · Hard Challenge link
Answer

BIN C

After boxes 1 and 2, box 3 goes left, right, right.

Hands Apart: 9:45

What is the SMALLER angle between the hands?

Video · Genius Challenge link
Answer

22.5°

The minute hand is on 9; the hour hand is 3/4 of the way to 10: 3/4 × 30° = 22.5°.

Flip, Then Turn

Which card do you get?

Video · Hard Challenge link
Answer

B

Flip left-right first, then a quarter turn clockwise: card B.

Challenge link