If there’s one thing we should know about Nintendo it’s that its games tend to carry on selling – so a number two debut in the Japanese software charts for Nintendo’s Wii Fit can be considered an extremely strong debut.

Its 261,000 week one sales were not quite enough to rob Level 5’s highly anticipated DS logic-puzzler Professor Layton and the Pandora’s Box from claiming the top spot, with week one sales of 294,000. Ubisoft’s Assassin’s Creed also does well in the territory, debuting at number eight in the listings.

The Japanese Top 30 in full (according to data from Kotaku):

1. Professor Layton and the Pandora's Box (DS)
2. Wii Fit (Wii)
3. SD Gundam G Generation Spirits (PS2)
4. Dragon Quest IV (DS)
5. Sengoku Basara 2 Heroes (PS2)
6. Mario Party DS (DS)
7. World Soccer Winning Eleven 2008 (PS2)
8. Assassin's Creed (Xbox 360)
9. Mario & Sonic at the Olympic Games (Wii)
10. Yu-Gi-Oh! World Championship 2008 (DS)
11. Super Mario Galaxy (Wii)
12. World Soccer Winning Eleven 2008 (PS3)
13. Naruto Shippuuden: Gekitou Ninja Taisen! EX 2 (Wii)
14. Wii Sports (Wii)
15. Wii Play (Wii)
16. Shin Sangoku Musou 5 (PS3)
17. Makai Senki Disgaea Portable (PSP)
18. My Housekeeping Diary (DS)
19. Mario Party 8 (Wii)
20. Mega Man Star Force 2: Berserk × Dinosaur (DS)
21. Mega Man Star Force 2: Berserk × Shinobi (DS)
22. Resident Evil: The Umbrella Chronicles (Wii)
23. Mario Kart DS (DS)
24. Professor Layton and the Curious Village (DS)
25. Kodai Ouja: Kyouryuu King 7-tsu no Kakera (DS)
26. Yes! PreCure 5 (DS)
27. Pokémon Mysterious Dungeon: Time Expedition Party (DS)
28. Flash Focus: Vision Training in Minutes a Day (DS)
29. New Super Mario Bros. (DS)
30. Pachitte Chonmage Tatsujin 13: Pachinko Hissatsu Shigotojin III (PS2)