I'm not going to be as pissed off as Arc (which is understandable, given how much work he put into his run), but I would like to respectfully disagree with the obsoletion judgement.
Mukki, I appreciate your attentive judgement that you posted, but I think that things ended up backwards here. I believe you said that you felt this Arcade run felt a lot like the NES run, whereas the Arcade run of Ghouls and Ghosts has been judged to be distinct enough to merit separate publication. However, I would say the exact opposite is the case: the Arcade version of this game is considerably distinct from the NES version, while the Arcade version of Ghouls and Ghosts is not too distinct from the Genesis version and should obsolete it.
(I know you said you wouldn't base your decision on the Ghouls And Ghosts decision... neither will I, as best I can. My two arguments following should be fairly independent of one another.)
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For instance, you mention the glitch to fire rapidly in this Arcade version of Ghosts 'n Goblins. That changes the gameplay quite significantly, allowing boss strategies that wouldn't be possible in the NES version. Arc's NES run manages to have a very different feel in those fights, as he must be much more careful at managing his distance to a boss.
He must also be much more economical about where to take damage boosts in the stages. When watching Arc's run, I was quite surprised by how clever some boosts were (especially Stage 6). I was not as surprised by the boosts in this Arcade run, even though I did appreciate them.
Basically, these kinds of challenges make the Arcade version of this game easier and less impressive. This is a good run, but I don't feel it ought to obsolete Arc's movie.
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Now, if I consider Ghouls and Ghosts, its Arcade and Genesis versions are extremely similar. In all the gameplay differences, the Arcade version is tougher, as was discussed in
its discussion thread. In that case, the only factor that stuck out as an advantage for the Genesis version was the use of a password to effectively skip one playthrough of the game.
As I posted in that thread, I believed xipo's Arcade run should've caused an obsoletion.
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Ultimately, I will not pursue a fight on this decision, and I mean no disrespect to any author or judge here. I just feel the obsoletion matter was not discussed enough in this proper thread, and this is my (more than) two cents on the matter. Ferret Warlord and Arc (and xipo for Ghouls and Ghosts), I salute you for making this game your bitch.