Saving

Hard-Save
 * Pros: No risk of save-scumming or player trapping themselves
 * Cons: Takes control from the player, breaks immersion

Perma-Death
 * Pros: Enhances immersion
 * Cons: Limited to a single play session
 * Neut: Mistakes are permanent

Quick-Save
 * Pros: Fast, consistent, gives control to the player
 * Cons: Promotes save-scumming, careless players can trap themselves, breaks immersion

Auto-Save
 * Pros: Enhances immersion, quality-of-life, no risk of save-scumming
 * Cons: Unclear triggers, takes control from the player
 * Neut: Mistakes are permanent

Note: These systems can and usually do overlap

Obsolete
 * Passwords
 * Warp Zone