I've been learning to apply my knowledge of x86/x64 and .NET/Mono reverse engineering to APKs. And I've been bringing my reversing knowledge back up to date. In fact, I just cracked the Fighting Fantasy Classics Windows version, stripping out the Steamworks protection and the online DRM. I originally came here to get the mod APK with all the books before I realised that SB Points are hard to get (to the point where it was easier for me to crack it myself), the licence system is extremely offputting, and the Android version is about 7 books behind the Steam version anyway.
I wouldn't mind putting my brain to good use by deep diving into some mods, diffing them with the original APKs, and looking at bugs/malicious inserts from the code side.