Is the 'impossible' room possible?

Question

I'm playing through the Blocks That Matter demo and there's one bonus level called 'Impossible.' I have four blocks of sand I can arrange in a tetris shape and they're affected by gravity. I can jump 2.5 blocks' height and I need to reach a place that's high seven.

Is this level actually impossible?

Answer

Obviously yes, Impossible is possible.

Unlike in Minecraft, sand takes a while before it actually falls down to gravity, so you can just build one tile higher and hurry before the entire contraption falls down.

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