You can turn off the sound volume for Bounce and other games by making the following change in the active profile (instructions below for Nokia 6700 slide):

  1. Select Menu > Settings > Profiles
  2. Select the active profile
  3. Select Options > Personalise
  4. Set Warning tones = Off

A quick way to turn off the games sounds is to select either the Meeting or Silent profile where the warning tones are by default disabled.