With the development of the aforementioned save function (complemented by the less popular password system, which is now seen as archaic), the Game Over message has become less common as players are allowed to respawn at a previous state of the game, which has been stored in memory either through a player deliberately saving the game or reaching a checkpoint (which causes the game to save automatically). Many modern games do not technically "end" until they are completed, and although "Game over" screens remain present in many of them in some form or another, it is uncommon for them to signify a forced return to the beginning of the game, and only marginally more common for them to signify a substantial loss of progress. Roguelikes are the most common exception to this rule; permadeath is often a staple of the genre.