Activision's latest filing with the Securities and Exchange Commission has revealed that the publisher paid US$99.9 million (77.7 million Euro) to acquire Guitar Hero publisher RedOctane.
The acquisition was announced back in May, and completed in June - but up until now, financial details of the deal had not been disclosed.
The SEC filing also states that former RedOctane shareholders could be entitled to more than US$50 million (38.8 million Euro) in additional Activision stock, if "the net income of the business over a certain period of time exceeds certain target levels by certain amounts."
Activision acquired RedOctane following the success of Guitar Hero, a PS2 title which comes complete with a guitar-shaped controller. The sequel is set to go on sale this November and, judging by the performance of the original game, it's likely to prove one of the top-sellers this Christmas. The Guitar Hero series is developed by Harmonix.