Develop a 2D sumo wrestling game with a top-down (bird's-eye) perspective. Implement the following: * **Characters:** Four distinct, fat sumo wrestler sprites. * **Player Control:** One wrestler controlled by arrow keys for continuous 360-degree directional changes. This wrestler moves at a constant speed in its facing direction. * **AI Opponents:** Three AI-controlled sumo wrestlers that also move at a constant speed in their facing direction. * **Movement:** All wrestlers move continuously in their facing direction. Arrow key input changes the player's facing direction. * **Objective:** Be the last sumo wrestler remaining within a clearly defined circular arena by pushing opponents out of bounds. * **AI Behavior:** Program the AI opponents to strategically attempt to push both the player and each other out of the arena. * **Starting Positions:** Each sumo wrestler begins on the edge of the circular arena, facing inwards.
