Numbs game
As you might have realised, Numbs is a freemium app with micro-transactions. The free-to-play version of the numbers game will restrict you to the multiplayer mode, which also throws you into the deep end with little practice. However, the option to unlock the premium features is always at easy reach and players can hence pay a one off fee to unlock the practice mode. The transaction is perfectly safe and is made through an App Store interface in less than two minutes. Once this is done, the door to unlimited practice and all of the premium features listed in posts below will become accessible once and for all. There is no room for hesitation, upgrade now!
Numbs-Numbers-Game-App 