The paper analyzes the computational complexity of all 15 2D Super Mario platforming video games released to date. The authors prove that 13 of these games are PSPACE-hard, using reductions from the PSPACE-complete "reachability with planar door gadgets" problem. The door gadgets constructed vary across the games, taking advantage of unique mechanics in each title.
For the remaining 2 games, Super Mario Land and Super Mario Run, the authors show that they are at least NP-hard, using a different reduction framework. The authors note that these games lack mechanics that can be used to build the door gadgets required for PSPACE-hardness proofs.
The paper also discusses the challenges in bounding the complexity of these games, as many have mechanics that can generate an unbounded number of on-screen objects, potentially leading to undecidability. The authors leave this as an open problem for future work.
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