Ultimate Doom - Episode 1
Half-Life (only to Lambda Core at the end of it cause the scientist got glitched)
Half-Life: Opposing Force
Half-Life: Blue Shit
Worms 4: Mayhem
Soldier Of Fortune
Grand Theft Auto: San Andreas (with cheats)
Stronghold 2
and that might be all (i think). + My brother helped me a little bit.
Must say I'm glad I got LEGO instead : > Though I inherited a Sega Master System from my brother. But I never finished a game on it.
The Master System was my first ever console, I swear it was impossible to finish ANY games on it due to the fact there was no way to save the game, lol.
I couldn’t even tell you how many games I’ve completed before though, way too many.