Shooter DOOM is known for being played on a wide variety of devices. However, a developer named Danny Spencer decided to use the game for more practical purposes. He created a fully functional calculator in it, where the numbers consisted of samples.
Using the level editor, the author was able to release monsters so that they form numbers. The calculator can only add. You can separately create a calculator for subtraction or multiplication, but it seems that the system does not perform all actions at once.
In addition, the number reset mechanism is interesting – you just need to shoot monsters with firearms. It takes longer, but is more fun. You also need to enter numbers with shots.
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Source: VG Times