this is often thought of as why super mario 4 was the most innovative game at the time of release. up to that point mario while super addicting and approachable was often difficult for non gamers and new players. creating a rift between gamers and non gamers until mario world came out.

instead of starting levels over from the beginning you could instead save checkpoints and save power ups to use later in levels. checkpoints would also fully heal you to a big mario. this along with a link to the past making zelda more approachable for a bigger audience grabbed the entire world by storm in the 90s.

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just some shinfo.