A good solution is to make it impossible to use the more complex rules. For example: - don’t put pawns or rooks in the first levels of chess, so that players w

A good solution is to make it impossible to use the more complex rules. For example: - don’t put pawns or rooks in the first levels of chess, so that players won’t try to take en passant or to castle. - only put cars with automatic gear boxes in the first levels of a racing game, so that players won’t try to switch gears manually. - don’t have under water/vacuum spaces/mountains/swamps or more advanced enemies or weapons in the first levels of a first person shooter. That may not work for every game, though. You can also make the UI visually distinctive in the earlier levels. Less detailed images may help cue the user that they have fewer/simpler features.