Riddles, one at a time
Mirror Clock: The Long Wait
Video · Expert
Challenge link
4 hours 11 minutes
16:61, 17:71, 18:81 and 19:91 are not real times. The next is 20:02, 4 h 11 min after 15:51.
Five Sheets, One Pile
Which sheet was placed SECOND?
Video · Medium
Challenge link
SHEET E
Order: C, E, A, D, B. Lift them off and see.
Fewest Tokens: Pay 11
Which tokens pay 11 with the fewest tokens?
Biggest first is not always fewest. Try every pair.
Video · Hard
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5 + 6
Just 2 tokens. Biggest first, 9 + 1 + 1, needs 3.
Old Phone Keys: 2283
Which of the four words types 2283?
The third letter decides it: which key is it on?
Video · Medium
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CAVE
C and A are on 2, V on 8, E on 3: 2283.
Inside the Loop: Only One Is In
Which gem is INSIDE the loop?
Count wall crossings on the way to the edge: odd means inside.
Video · Medium
Challenge link
A
A line from gem A to the edge crosses the wall an odd number of times; from B, C or D, an even number.