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Spelunky is an open-source, procedurally generated, 2D roguelike platformer where you make your way through endless caves, all while trying to collect treasure and destroy enemies, without dying.
SpecsUpdate
Pros
Pro Progression is solely based on the players skill, requiring the player to get better and better in order to succeed
Spelunky gives the player every tool and ability needed to succeed from the start. The only thing you gain from playing is a greater level of skill and experience – both of which will be necessary to progress further than you last did.
Pro Convenient save system allows for quick quick play sessions
At its heart, Spelunky is a roguelike. This means each game session tends to be short, as the player will die quite often. As a result, Spelunky can be played in quick bursts throughout the day. The convenient save system facilitates this play style by making it easy to pick up where you left off.
Pro Quick sessions so you can play in short bursts
Being that Spelunky is at its heart a roguelike the gameplay sessions can tend to be quick as the player will die quite often. This makes for something that can be played in quick bursts throughout the day. The convenient saving also lends to this as a game that is still ongoing can be quickly saved in order to be picked up at a later time.