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...You may play against one or more computer/human players using this game with different selectable computer players' skills. Computer player examines own her step only, so the analysation depth is only 1, trying to gain the maximum available extra points. Turning trace mode on it is possible to play against computer with ultra skill level, where the analysation depth is increased to 2. With this setting the AI is stronger but the gameplay is unbearable slow. It is just for test purpose.
Worldlines visualizes special relativity, as particles near lightspeed trace paths in a 3D slice of 4D Minkowski spacetime. Scenes illustrate time dilation, the twin paradox, length contraction, and Bell's spaceship paradox.