The NPD Group reports that for the month of April 2010 (data tracked April 4 through May 1), Ubisoft's Splinter Cell: Conviction sold just shy of half a million units (486,100) to claim the top spot in the US software chart.

The only other new release to chart was Capcom's Super Street Fighter IV. The PS3 grabbed 10th place with 143,000 units, while the Xbox 360 version charted outside the Top 10 with 108,000 units.

Elsewhere there were pretty large declines from March's big releases.

"A big contributor to the decline in software sales comes from the March '10 new releases, which fell off more dramatically than did last year's March releases," commented NPD analyst Anita Frazier. "In aggregate, March '09 new releases dropped off by 54 per cent in April '09 sales, while this year, new releases in March '10 dropped off by 75 per cent in April."

1. Splinter Cell: Conviction: 486.1K

2. Pokemon SoulSliver: 242.9K

3. New Super Mario Bros. Wii: 200.3K

4. Pokemon HeartGold: 192.6K

5. God of War III: 180.3K

6. Wii Sports Resort

7. Bad Company 2 - Xbox 360: 166K

8. Wii Fit Plus

9. Just Dance

10. Super Street Fighter IV: 143K