4.5 rounded up to 5. It really is a fun game and I have enjoyed it up to this point, especially the special events. I like the stories and puzzles. Very well done. Unfortunately, each new area increases the amount of energy to break a block disproportionately to the improvement of the equipment, at over 10k/hr, in China I can break maybe 8-15 blocks, some blocks are 15k energy. It's just not fun for me anymore. It has definitely been worth playing, but now uninstalling.