by jgibbs » Fri Mar 29, 2013 10:38 am
Get more medals and do the trophy challenges. Once you've completed any medal/trophy challenge, it's value drops to $25, so you need to hunt down levels that you haven't completed yet to get the bigger rewards.
In addition to this, I'm working on a bit of a web treasure hunt at the moment that'll be in the game shortly. You'll be rewarded with things like in-game credit for finding the links in web sites that have connections to 4x4 Adventures. This system will most likely be used to unlock the extra bonus vehicles when they are released too.