Freezer Hint

[James]

I'm not sure what style of hint you want, so:

Small hint:

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Approach the north-east section of the block area from the bottom rather than from the left.

Larger hint:

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Try moving 2 spaces at a time through the blocks to make 2x2 "c" shapes, rather than zig-zagging your way through.

Complete spoiler:

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From the blue lock: U 2L 2U 2R 2U gets you the blocks you need.