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Movement:

Arrow keys: These are your trusty tools for navigating your circular character around the map.
Down arrow (optional): Some versions might allow you to control your descent after jumping, but this isn't always a feature.
Up arrow: Jump (essential for pushing opponents and staying on platforms).
Left/right arrows: Move left or right.

Weight Manipulation:

X key: This key is crucial for strategic gameplay. Pressing and holding the "X" key increases your character's weight. This makes you more difficult to push around and can be used to:
Push other players off the platform.
Hold down platforms with moving objects.