THQ's UFC Undisputed 3 took to the top of the UK sales charts last week in its opening weekend, while last week's number one Kingdoms of Amalur: Reckoning fell out of the top 10. For the week ended February 18, and according to data from tracking firm Chart-Track, Kingdoms of Amalur: Reckoning spent just one week in the top 10 before dropping down to number 12, with a 63 percent drop in sales. The previous two titles in the UFC Undisputed franchise sold better in their launch weeks than this latest in the franchise, with the first game outselling UFC Undisputed 3 by more than 3 to 1. Boosted by the release of the Nintendo 3DS version, Mario & Sonic London 2012 Olympic Games continued to rocket up the charts, settling for fourth position, its highest chart position to date. Activision's Skylanders: Spyro's Adventure re-entered the top 10, sitting at number 7, while Just Dance 3 also bobbed back in, scraping in at number 10. Below are Chart-Track's all-platforms sales charts, which include unit sales of all versions of a given title, and the individual platform charts, which treat individual SKUs separately. UK All-Platforms Top 10 1. UFC Undisputed 3 (THQ) 2. FIFA 12 (EA) 3. Call of Duty: Modern Warfare 3 (Activision) 4. Mario & Sonic London 2012 Olympic Games (Sega) 5. Battlefield 3 (EA) 6. Final Fantasy XIII-2 (Square Enix) 7. Skylanders: Spyro's Adventure (Activision) 8. The Darkness II (2K Games) 9. The Elder Scrolls V: Skyrim (Bethesda) 10. Just Dance 3 (Ubisoft) UK Individual Platforms Top 10 Both the Xbox 360 and PlayStation 3 versions of UFC Undisputed 3 took positions one and two in Chart-Track's individual formats top 10 chart respectively, keeping the Wii version of Mario & Sonic London 2012 Olympic Games at bay. There were no other new releases, with usual suspects such as Call of Duty: Modern Warfare 3 and Battlefield 3 hanging around. 1. UFC Undisputed 3 (THQ, Xbox 360) 2. UFC Undisputed 3 (THQ, PS3) 3. Mario & Sonic London 2012 Olympic Games (Sega, Wii) 4. Call of Duty: Modern Warfare 3 (Activision, Xbox 360) 5. Battlefield 3 (EA, Xbox 360) 6. FIFA 12 (EA, Xbox 360) 7. Call of Duty: Modern Warfare 3 (Activision, PS3) 8. Final Fantasy XIII-2 (Square Enix, PS3) 9. Just Dance 3 (Ubisoft, Wii) 10. The Darkness II (2K Games, Xbox 360)