Nothing is wrong. I'm sorry, I'm a noob with this mistake: let block = Block() world.place(block, atColumn: i*2, row: 2) instead of writing it as; world.place(**Block(),** atColumn: i*2, row: 2) I still don't know what's my main mistake (I mean the rule I didn't do right) but I'm gonna learn it tho. Thanks to 98 viewers anyways.

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