5x the install base of each platform. In total, there's (was) about 100M PS2s and 40M XBs+GCs. That's a 40% larger market if you go multiplatform. How many devs really don't need to care about a potential extra 40% sales, especially if the economics is all they base their decisions on?
Depends on how easy to port the titles where, how many huge million sellers were there in the PS2 family that were third party that werent ported or multiplattform to begin with?
Final Fantasy X (however didn't Square-Enix had ome sort of exclusivity deal with Sony?)
Kingdom Hearts - square
Final Fantasy X-2 - square
Dragon Quest VIII - square
Final Fantasy XII- Square
Tekken 4 - Namco
Pro Evolution Soccer 2 (WE6) (PES4 came to xbox)
Pro Evolution Soccer 3 (WE7)
Dragonball Z: Budokai - BANDAI
Ace Combat 2 - BANDAI
Devil May Cry - Capcom
Kingdom Hearts II - Square
Resident Evil: Code Veronica X - Capcom
Dragonball Z: Budokai 3 - BANDAI
Soul Calibur 2 -
Devil May Cry 2 - capcom
Dragon Quest V Remake - S-E
DMC 3 - Capcom
Ace Combat 5 Namco
Resident Evil Outbreak Capcom
Tekken 5 - namco
Dragonball Z: Budokai Tenki - BANDAI
Metal Gear Solid 3- capcom
Taken from vgcharts.org
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Thats 23 titles that were millionselling and not ported to the Xbox or the GC, out of a total 169 game titles that were million selling (including first\second party). If we remove the number of SONY published games on that list (23) we got 23 titles out of 146 that were not ported.
So only 15,7 % of the million selling third party titles were not ported, most of theese games are very Japan friendly games, that would probably not do so good in the west. 84,3% of all million selling third party games were multiplatform.