Don't worry. You don't have to make a decision right away. Play "Assembly cube hard" to talk about strategy, after all, this is a game to remove lines, and classic game play similar. You'll get blocks of all shapes and sizes, and you'll have to match them with the immobile stones that already exist on the field. Your goal is to fill the rows or columns with the shapes given by the game, thereby eliminating these stones. As soon as a row or column is filled, they disappear, including the stones inside. Once you've cleared all the stones, you can move on to the next level. If the card is closed or there are no more steps to go, you will have a chance to use the Wheel of Fortune once per level, which will give you a power boost and help you make some room. You can use this power at any time, not necessarily until you pass. The Wheel of Fortune may allow you to destroy one or more stones, but my advice is: don't use power-ups unless you really need them. Good use can help you get a high score, bad use may be the end of the game. So, it pays to use it in the Nick of time.