Perhaps he has played  few games on multiple systems (I generally try not to buy games again, but even I have 2 of my games span systems, OoT... which I never bought on N64 but it was where I first played it before owning it on GC, and F-Zero X, which I sold along with my N64, but bought it again on the Virtual Console)

PC:24
PS3: 18
PS2:4
N64:2
PS1:1
GB:1

technically I've played the N64 on an emulator on my PC and the PS1 game on my PS3

a lot of the PS3/PC games are multiplat as well.

Finally organized my list. Here's my breakdown:

DS: 13
GBA: 12
PC: 10
PS2: 8
SNES: 4
N64: 4
NES: 3
3DS: 2
GB: 1
Arcade: 1
Various: 1

I sure do love my Nintendo handhelds.

If we're going to do some lists...

Genre:

Platformer: 15
Action/Adventure: 9
RPG: 6
Strategy: 6
Action: 4
Fighter: 4
Racing: 3
Shooter: 2
Rhythm: 1

Console:

Wii: 14
GameCube: 9
Nintendo 64: 9
DS: 6
GameBoy Advance: 4
Genesis: 4
PC: 4
Super NES: 3
Xbox 360: 2
3DS: 1
GameBoy: 1
iPhone: 1

Year:

91: 2
92: 1
93: 0
94: 2
95: 2
96: 1
97: 2
98: 4
99: 2
00: 2
01: 4
02: 3
03: 2
04: 1
05: 4
06: 1
07: 5
08: 4
09: 2
10: 4
11: 2

Also, I'll be sending you guys a final PM before the event starts in a couple of days. I hope your lists are going well!

My platform breakdown:

PC: 23
DS: 10
PS2: 6
GBA: 5
N64: 4
PS: 1
PSP: 1

More of my stats.

Action: 2
Action Adventure: 7
Fighting: 1
JRPG: 15
Platformers: 7
Puzzle: 5
Rhythm: 1
Sandbox: 2
Simulation: 2
Shooters: 5
Strategy: 3
WRPG: 1

Count me in. Had fun with this last year and have a few new releases to add this year.

My platform breakdown...

N64 - 10
Wii - 8
PC - 8
PS3 - 8
SNES - 6
GC - 3
NES - 2
PS2 - 2
DS - 1
Mega Drive - 1
PS1 - 1

Platform breakdown:

PS3: 20
PS2: 9
X360: 4
N64: 3
PC: 3
PSP: 3
Wii: 2
NDS: 2
NGC: 1
PS: 1
PSN: 1
GB: 1
GBC: 1
GBA: 1