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Riddles, one at a time

Symbols keep their direction. Which cube folds from this net?

Video · Medium Challenge link
Answer

B

Folded up, star, ring and half-square sit just like B.

Full explanation on the blog

What day is today?

Video · Easy Challenge link
Answer

Wednesday

Two days back from Friday: Thursday, then Wednesday.

Which colour hides under the ? card?

Video · Medium Challenge link
Answer

B RED

Magenta stops green, yellow stops blue: red is left.

A robot climbs a 10 m wall. Each day it climbs 3 m; each night it slips back 2 m. On which day does it reach the top?

Video · Genius Challenge link
Answer

Day 8

After night 7 it is at 7 m; day 8 takes it to 10 m.

Which word fills the gap?

Video · Hard Challenge link
Answer

TRAIN

BRAIN to TRAIN changes B to T; TRAIN to TRAIL changes N to L.

After how many hours are they the same height?

Video · Expert Challenge link
Answer

5 hours

After 5 h: A is 32 − 20 = 12 cm, B is 22 − 10 = 12 cm.

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