Army vs Queen

You play White with the full set of sixteen pieces. Black has a king, eight pawns and a queen. Checkmate the black king to win. This is real chess with real rules, so castling, en passant and promotion all work, and a pawn that reaches the far side becomes a queen.

The queen can attack two things at once, so after every move ask what she can take. Chase her with pieces that are defended and she has to run.

Three levels: on easy Black moves at random, on medium it usually grabs a piece you leave undefended, and on hard a real chess engine looks a few moves ahead. Win once for a silver star, and ten times without undo for a gold one.