Combination Lock Sim is an useful and funny brain trainer. The app will make you feel like a real cracker or pillock. The program provides three modes. The first one is "Disk Shutter", which offers you to remember a sequence of numbers and then to reproduce the code. The second one, "Intercom", is more complicated and requires your sagacity. And the third one, "Keyboard", wants you to do the same but with letters.
Practice recognising different frequencies with this free piece of software
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