One or two underground repackers have created a "Stripped to Core" version. This file is 180MB–250MB (not 100MB). It contains:

Legitimate repackers (like FitGirl or BlackBox) compress games heavily, but even their smallest FIFA 13 repacks hover around 2.5–3 GB . 100MB is literally two orders of magnitude smaller.

The PlayStation 2 version of FIFA 13 is completely different (legacy gameplay) but is only . Using the PCSX2 emulator, you can play a compressed ISO. PSP version is even smaller: 300MB .