Splatoon is the fifth fastest-selling game on Wii U and replaces Zombi U as the biggest-selling new franchise.
Unfortunately for Nintendo, however, it fails to dislodge The Witcher 3 from the top of the all-format gaming chart.
Despite a 69% week-on-week drop in sales, The Witcher 3 remains first, ahead of the aforementioned Splatoon in second and GTA 5 in third.
A 51% hike in sales sees FIFA 15 remain fourth, above Farming Simulator 15, Battlefield Hardline, Project Cars and Destiny.
Mortal Kombat X and Minecraft: Xbox Edition complete this week's top ten.
The top 20 in full:
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1. (1) The Witcher 3: Wild Hunt (Bandai Namco)
2. (-) Splatoon (Nintendo)
3. (3) Grand Theft Auto 5 (Rockstar)
4. (4) FIFA 15 (EA Sports)
5. (2) Farming Simulator 15 (Koch Media)
6. (7) Battlefield Hardline (Electronic Arts)
7. (5) Project Cars (Namco Bandai)
8. (10) Destiny (Activision)
9. (8) Mortal Kombat X (Warner Bros)
10. (13) Minecraft: Xbox Edition (Microsoft)
11. (12) Dying Light (Warner Bros)
12. (6) Wolfenstein: The Old Blood (Bethesda)
13. (14) Minecraft: Xbox Edition (Sony)
14. (18) Far Cry 4 (Ubisoft)
15. (9) Call of Duty: Advanced Warfare (Activision)
16. (17) Terraria (505 Games)
17. (16) WWE 2K15 (2K Sports)
18. (11) Bloodborne (Sony)
19. (-) LEGO Batman 3: Beyond Gotham (Warner Bros Interactive)
20. (-) Skylanders Trap Team (Activision)
Leisure software charts compiled by Chart Track, (C) 2015 Ukie Ltd.
Watch a trailer for The Witcher 3 below:
