Why Medium feels different
Medium examines the likely answer to its candidate moves, which makes simple one-move traps less dependable than they are on Easy. It still varies between close alternatives, so games do not collapse into one fixed script. The useful challenge is maintaining sound development while responding to threats that change from game to game.
Use a three-question tactical scan
Before committing, ask: what is checking me, what can capture me, and what becomes loose after my move? At 10+5, reserve most of the starting bank for positions with forcing checks, captures or threats. Make routine recaptures promptly and let the increment replenish a small reserve instead of spending equal time on every decision.
When to move up- Or stay here
Move to Hard when you can complete several games without dropping a piece to a single reply and can explain where your clock time went. Stay on Medium if your results swing because of overlooked attacks rather than strategic plans. Repetition at one level is useful when each game has a specific review question.