In1klap is a music education app where students read music notation by pressing the right key at the right time during each test. Tomasz Kaye originally wrote it for OS X but Rapucation needed a Windows version as well. Converting the project took only a few days, but the timing was way off. Apparently  it is rather difficult to achieve tight timing on Windows, it took me several months and every trick in the book to get the timing right, but it is now tighter on Windows than the original OS X version. Learnt a LOT from this one.

Techniques used:

C++, openFrameworks