Emulator detected.png|Emulator detected in Open Tower Defense
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On ZX Spectrum, they took this even further with a game that specifically relies on a weird undocumented behaviour of the Z80: [https://spectrumcomputing.co.uk/entry/31198/ZX-Spectrum/MEMPTR_Snake MEMPTR Snake]
There is also this initiative for emulators who willingly want to be detected: [[Emulator_IDs|Emulator IDs]]