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Memorise the order in which colours are displayed, then input them by pressing primary fire while in the coloured rings. Guessing the correct order will move you to the next level where you will need to remember another colour. The higher level you are on, the more you'll have to remember. If you are unable to guess what you the right order in time, you are eliminated. Have the highest level reached to win the game.
On classic mode the order count will start at 3 and 1 will be added every level.
Use the custom mode settings to change the initial order count, order count increase per level and time limit modification