1. The spaceship you control the mouse,
2. Shot with the left mouse button,
3. When you lose you can upgrade your vehicle,
4. If you have a slow computer you can reduce delays by pressing "L".
Area: z - rectangle, x - triangle, c - trapeze, v - circle,
Circuit: a - rectangle, s - triangle, d - trapeze, f - circle,
Volume: q - cuboid, w - cylinder, e - cone, r - pyramid,
b - prime numbers generator,
space - stop numbers generating / hide list,
n - convert to binary system.