I am pretty sure he meant tough. 

BTW. You listed 6 games when i said 3. If your gonna name more just listed as honorable mentions.  :)

Mario Kart Wii
Metroid Prime Trilogy
Muramasa

1) Uncharted 2: Among Thieves
2) Portal 2
3) Mass Effect 2

With God of War III a VERY close fourth.

Team Fortress
Blazblue
Demons souls

Holy shit this is really hard. Okay so I guess it's gonna be

1. GTA 4
2. God of War 3
3. Killzone 3

Honourable mentions:

Metal Gear Solid 4

Halo Reach

Uncharted 2

Killzone 2

1) Uncharted 2
2) God Of War 3
3) Hmm..It's a toss up between Metal Gear Solid 4, Assassin's Creed 2, and Little Big Planet 1.

Noteable Mentions:
AC:Brotherhood,
Mass Effect 2
Red Dead Redemption & Undead Nightmare
Killzone 2,
Dead Space Series (1, 2, Extraction)
Legend of Heroes: Trails in the sky

1. Donkey Kong Country Returns
2. The World Ends with You
3. Super Mario Galaxy

1. Mario Kart Wii
2. Super Mario Galaxy 2
3. New Super Mario Brothers Wii

Demon Souls
Eternal Sonata
Persona 3