Infinite practice
Each template generates a fresh problem on demand by filling in random numbers. Useful for drilling a specific skill until it sticks. Progress on generated problems isn't synced — these are throwaway practice.
About difficulty: levels (D1–D4) are relative to each template, not absolute. A D3 in one topic isn't necessarily as challenging as a D3 in another — they reflect variation within the same generator (e.g. bigger numbers, harder rule combinations, multi-step setups).