Walking on the ground, you cannot walk onto 2 boxes that's on the same square!
To walk up on these, you must be standing on at least 1 box first!

But walking down, it doesn't matter if you're standing on 3 boxes and you're reaching for a tile that doesn't have any boxes at all.

See it as a stair, each box is a stair for you.
You can't walk up from stair 0 to stair 2, you must take 1 stair at the time!
But you can always jump all the way back down.

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