The issue: Certain kinds of games require that players keep one or more specific goals in mind as they play. Players who return to a game after a long absence may find it difficult to remember what they're supposed to do next, which may impede their progress.
Resolution: Provide some sort of reminder of the player's unfinished tasks. This may assume such different forms as a list of pending and completed goals (Psychonauts), an in-character reminder of pending goals (Dragon Quest VIII), or a video log of significant cutscenes (Ratchet and Clank: Going Commando). If any of the tasks require knowledge of specific details previously revealed in play, the player should likewise be reminded of those details.