once i got my third soldier i thought i could simply steamroll through the lower levels on higher difficulty again to gather these upgrade stars. i started the lower levels again and my third guy was gone..major turnoff xD also the upgrades during the fight(with gold) did not function and i had to always just spam traps..and the game crashed a bit. oh! aaaannd clicking the guide does not open a guide and the game did not save. it needs work. still a nice game though.