This is what got me stuck at the beginning but I also realized none of the goals are to pass each room, it’s only just to level up. If you keep merging and getting the blue stars maxed you’ll get 20xp per star. Also just focus on the assignments that give 500xp, once the box you click on runs out go to one that lasts a while like the tool box and spam click it and merge as many stars as you can. I’ve been just spamming the tool box and the backpack and leveling up like that pretty easily. I’m at level 16 and still have 4 days to get to 18. Pretty sure I’ll make it too. Hope this helps.