Could be great. But.... The 3 wagon limit for rewards is annoying. Once you get to 3 you have to wait until you can open 1 (can only open 1 at a time). Each wagon takes time to unlock. These 3 points have ruined so many great games and I feel this is another one that could have been a main game on my phone but instead looks like a 1hr play then a give up and consider whether it's worth the space or not.