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Simply arrange the tiles so that they create a closed circuit, such as a circle or oval. Sounds easy? Unfortunately, you can only move a column or row at a time ?so moving a tile usually moves more than one. Everyone who plays can track their personal scores and see which levels they have solved. Each with its own combination of blocks, controls and strategy. Play them in any order you want ?you don't have to beat level 21 to play level 22. There are no timers, no need for quick keyboard action or other stressful requirements to play. The only challenge is deciding how to get those tiles into place.