Good problem and I love the level idea.
Are you in or are you out?
Create a Multiplication table matrix...
Magic is simple (for beginners)
Integer Sequence - II : New Fibonacci
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Return the sequence element II
Juggler sequence revisited
The sliding puzzle: 15
Optimally fill a container with elements of different sizes
Number construction III
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