Every move adds rocket fuelكل حركة بتملا الصاروخ وقود
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Blast off to the planets!انطلق للكواكب!
Teacher keys: Space start / pause · Esc stop · 1 Mini · 2 Full ·
+ add a rep · N or → next exercise · L language · S sound & voice ·
C camera · F full screen. No camera? + or a mouse click adds fuel.