This task doesn't have dump zones, but attempts to “store” or retain some information about past place actions. Every time a piece is place in the stack, the stack model needs a height adjustment. Maintain some internal model of the stack. The simplest stack just places the piece on top of each other with same orientation.

Maybe even be able to visualize it.

Should there still be different piece types? Maybe one class can still be dumped into a bin but the other two types should be stacked?

Optional: Try to alter the orientation by rotating every other piece.

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