Board Thread:Questions and Answers/@comment-10802439-20140619073822/@comment-10802439-20140624053231

When you're in the map, there's two gauges in the up-left corner. The blue one is your XP and the green one is your energy. Energy is used to play a level and reloads over time, so if you don't have enough energy, a message appears telling you to wait until your energy level is higher. If you have like 2 energy points, it won't work since a level need something like 5 energy points, so if you don't have energy, wait until it reloads, and then you'll be able to play. If it's not the source of the problem, then sorry, I dunno.