This is the official Mortal Kombat game released for the PSP. Around 900MB - 1GB.
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Emulation and ROM sites are notorious for aggressive popup ads. Use a secure browser to protect your device. To help you get the best setup, let me know: Do you prefer 3D fighters or classic 2D style ? What controller setup are you using on your phone? This is the official Mortal Kombat game released for the PSP