Floor, an offshoot of Warner Bros. In September, the band went to Canada to record their fourth album at The Warehouse Studio in Vancouver (where it was engineered by Mike Fraser), and The Farm Studio in Gibsons. From these sessions the song "Semi-Mental" was released as a digital download on 25 December. On 5 March 2007 "Saturday Superhouse" was released, reaching No. 13 on the UK Singles Chart. Puzzle was released in June and helped the band to reach their highest UK Albums Chart position ever, hitting No. 2 in the first week of release, also reaching No. 17 in Ireland, and No. 39 in the overall world charts. The album is certified Gold in the UK, having sold over 220,000 copies, and as of February 2009 has sold over 300,000 worldwide. This album is notable for having somewhat more straightforward song structures and a more melodic overall sound than their previous work, while still retaining some more unusual elements. Puzzle was voted the best album of 2007 by Kerrang! and Rock Sound. On 25 August, it was announced that "Machines" would be the next single from Puzzle, which was released on 8 October. Support slots for acts such as Muse (at the new Wembley Stadium), The Who, Red Hot Chili Peppers and The Rolling Stones were significant in expanding Biffy's fan base. The band also played the Download 2007, Glastonbury 2007, Reading and Leeds Festival and T in the Park for a record seventh time. The band opened for Linkin Park during January on their European tour. In 2008, the band toured with Queens Of The Stone Age on their European and North American tours for Era Vulgaris, and opened for New Jersey rockers Bon Jovi at Twickenham during the Lost Highway Tour. In December 2008 the band played their biggest headline shows, including a date at Glasgow's 10,000 capacity SECC. 2008–2010: Only Revolutions The band released a new single entitled "Mountains" in July 2008, which reached No. 5 in the UK Singles Chart – the band's first song to reach the top 10, and their highest charting single to date. "Mountains" would later be included on their new album. In an interview with the NME, the band stated that they had started work on a follow up to Puzzle, with Simon Neil saying that the album would include some of the band's "heaviest riffs to date". In an