The ScaleBlitzer app enables you to set up your user account, your character, and your position on the leaderboard. Once this is done, you’ll need an instrument pack to work with. Think of this as your workbook for the level you are up to. Stage 1 is free (for any instrument) and covers Preliminary to Grade 1 in most syllabuses. The higher Stages are far more complex and have tens of thousands of possible combinations for practice.