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You have to cross the "fragile bridges" (cannot put all four parts of the block on them). There are 2 variations with the same number of moves.

The 21 moves are:

A) up right down left up

right right right right right

right up right down left

up up right down left

up

U R D L U R6

U R D L U2 R D L U

B) up left down right up

up left down right up

right right right right right

right up right down left

up

U L D R U2 L D R U

R6 U R D L U

* note that the same 5 moves (URDLU) are used in both: once then twice in the first variation / once after ULDRU, then once more in the second variation.

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11y ago

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