In general i always make two version. One paid version and one free with ads. All my application can be seen on the android market here: https://play.google.com/store/apps/developer?id=nenoff
Fireflies LWP free: https://play.google.com/store/apps/details?id=com.nenoff.fireflyfree
Fireflies LWP pro: https://play.google.com/store/apps/details?id=com.nenoff.firefly
3D Zombie Ants Smasher Ball free: https://play.google.com/store/apps/details?id=com.nenoff.antsfree
3D Zombie Ants Smasher Ball pro: https://play.google.com/store/apps/details?id=com.nenoff.ants
3D Gyroscope Free: https://play.google.com/store/apps/details?id=com.nenoff.gyroscopefree
3D Gyroscope Pro: https://play.google.com/store/apps/details?id=com.nenoff.gyroscope
3D Train Tunnel LWP Free: https://play.google.com/store/apps/details?id=com.nenoff.tunnelfree
3D Train Tunnel LWP Pro: https://play.google.com/store/apps/details?id=com.nenoff.tunnel
Fart Saber of Light Force Free: https://play.google.com/store/apps/details?id=com.nenoff.saberfree
Fart Saber of Light Force Pro: https://play.google.com/store/apps/details?id=com.nenoff.saber
Star Flight LWP: https://play.google.com/store/apps/details?id=com.nenoff.starflightfree
Star Flight LWP Pro: https://play.google.com/store/apps/details?id=com.nenoff.starflight
Spin the Fart Bottle Free: https://play.google.com/store/apps/details?id=com.nenoff.bottlefree
Spin the Fart Bottle Pro: https://play.google.com/store/apps/details?id=com.nenoff.bottle
Orcs Invasion Tower Defense: https://play.google.com/store/apps/details?id=com.nenoff.ballistafree
Orcs Invasion Tower Defense Pro: https://play.google.com/store/apps/details?id=com.nenoff.ballista
Russian Roulette Fart Revolver: https://play.google.com/store/apps/details?id=com.nenoff.frevolverfreev
Russian Roulette Fart Gun Pro: https://play.google.com/store/apps/details?id=com.nenoff.frevolverfree
Moon Racer free: http://play.google.com/store/apps/details?id=com.nenoff.moonracerfree
Moon Racer PRO: http://play.google.com/store/apps/details?id=com.nenoff.moonracer
Tetricorn free: http://play.google.com/store/apps/details?id=com.nenoff.tetricornfree
Tetricorn PRO: http://play.google.com/store/apps/details?id=com.nenoff.tetricorn