Minus World

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JamesMuddy
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Post » 21 Jun 2014, 13:42

Is this game a port of the original Mario Bros with the added portal gun? Because it's still possible to access the Minus world.

Or was it just programmed in?

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alesan99
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Post » 21 Jun 2014, 13:50

It was programmed in.
Mari0 is a recreation of Super Mario Bros., not a hack.

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JamesMuddy
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Post » 21 Jun 2014, 13:54

Ok, thanks. I was just curious, that's all.

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Superjustinbros
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Post » 21 Jun 2014, 19:58

Mario is programed much differently than SMB1, in that the infamous "go through blocks with well-timed jumps" bug that allows access to the Minus World wasn't replicated. To emulate this, there is a tile that is a copy of a vertical pipe's left edge, but without any collision.
This diagram shows which tile on 1-2's exit pipe isn't solid in Mari0, and thus you can go through it and trigger the phase-through effect.
Image
If Mario is inside any tunnel that is only one tile high, he is pushed in the direction opposite of where he is facing, phasing through any other block that exists as long as the tiles directly under his feet are solid.

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MissingWorld
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Post » 21 Jun 2014, 21:06

Superjustinbros wrote:Mario is programed much differently than SMB1, in that the infamous "go through blocks with well-timed jumps" bug that allows access to the Minus World wasn't replicated. To emulate this, there is a tile that is a copy of a vertical pipe's left edge, but without any collision.
This diagram shows which tile on 1-2's exit pipe isn't solid in Mari0, and thus you can go through it and trigger the phase-through effect.
Image
If Mario is inside any tunnel that is only one tile high, he is pushed in the direction opposite of where he is facing, phasing through any other block that exists as long as the tiles directly under his feet are solid.
Ohhhh. I was confused for the longest time why that duplicate tile was there. That explains that, then.

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JamesMuddy
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Post » 22 Jun 2014, 04:17

Superjustinbros wrote:Mario is programed much differently than SMB1, in that the infamous "go through blocks with well-timed jumps" bug that allows access to the Minus World wasn't replicated. To emulate this, there is a tile that is a copy of a vertical pipe's left edge, but without any collision.
This diagram shows which tile on 1-2's exit pipe isn't solid in Mari0, and thus you can go through it and trigger the phase-through effect.
Image
If Mario is inside any tunnel that is only one tile high, he is pushed in the direction opposite of where he is facing, phasing through any other block that exists as long as the tiles directly under his feet are solid.
Wow. That's a really cool way of making it work! Thanks for the explanation! :)

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Superjustinbros
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Post » 23 Jun 2014, 08:14

One thing I forgot to mention: In Mari0, if the "Welcome to Warp Zone" text isn't on the screen from fully scrolling to the right of the current room, any warp that's designed to lead to World 4 will instead go to the Minus world, labeled in the level files as M-1. One mod I remembered for 1.6 altered this so warps set to go to World 4 will always lead you to World 4 even without the text if the warp was set to take you there, and it could also send you to the Minus world with the text active.

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