Hmm okay, thanks for the error report. For now you can try a different browser or download the native executable for windows/linux.
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You are dropped in a hedge-maze containing multiple keys.
When all keys are collected you will advance to the next level and the maze will grow by two tiles.
Try to complete as may levels as possible.
You probably want to track where you are in the maze and which tiles are which.
This can be done on graph paper.
A dot represents explored empty space and a 'X' is a wall. (see image below)
Good luck! :)