This is the HD version of the famous iPhone game Alpine Crawler World.How to unlock SuperCar (4th vehicle): You have to finish all levels in one location in Time Trial or in Challenge mode. No matter which location, but you have to finish all levels in it.Alpine Crawler World HD is an Off Road simulation with real time physics, weather effects, different cars and tracks to choose and much more.Features:- 3 game modes (Free ride, Time trial, Challange)- 6+1 racing cars / sportcars for different terrains- 3 terrains / locations- 30 exciting and hard levels (10 per location)- differenet weather and day-night conditions (day, night, rain, snow)- visual effects (car-lights, car-colours, dirt)- 5 playable drivers (both male and female)- you can listen to music with iMusical while playing- 3 languages (hungarian, english, german)- unique and smooth gameplay- openfeint high-score list with many aspects