Cypress Hill released IV in 1998 which went gold in the US, on the backs of hit singles "Tequila Sunrise" and "Dr. Greenthumb". Sen Dog also released the Get Wood sampler as part of SX-10 on the label Flip. In 1999, Cypress Hill helped with the PC crime video game Kingpin: Life of Crime. Three of the band's songs from the 1998 IV album were in the game ("16 Men Till There's No Men Left", "Checkmate" and "Lightning Strikes"). B-Real also did voice work for some of the game's characters. Also in 1999, the band released a greatest-hits album in Spanish, Los grandes éxitos en español. In 2000, Cypress Hill then fused genres with their fifth album, Skull & Bones, which was a two-disc album. The first disc, "Skull" was composed of rap tracks while "Bones" explored further the group's forays into rock. The album reached the Top 5 on the Billboard 200 and number 3 in Canada. The first single was "Rock Superstar" for rock radio and "Rap Superstar" for urban radio. Following the release of the album, Cypress Hill (along with MxPx) landed a slot opening for The Offspring on the Conspiracy of One tour. The band also released Live at the Fillmore, a concert disc recorded at the Fillmore (in San Francisco) in 2000. Cypress Hill continued their experimentation with rock on the Stoned Raiders album in 2001. However, its sales were a disappointment, as the disc did not even reach the top 50 of the US album charts. In 2001, the group appeared in the film How High.