Tag: kidicarus

More NES Glitches Tested in Nintendo World Championships

We already linked to what turns out to be Part 1, back on Monday. This is Looygi Bros’ part two, nine minutes long:

Here’s our post on Part 1, and here’s a link to its video.

Looygi Bros. tends to make a series of videos on topics, so there will probably be a Part 3, and more. Instead of linking them all individually, I may wait for a bit and collect them all into one post, or maybe even add them to this post retroactively.

Here are the glitches in Part 2 listed out and explicated:

  1. Super Mario Bros, jump over the flagpole in World 1-1: Requires time-consuming setup, and useless for saving time, as the result is Mario can’t finish the level, but it does work.
  2. More invisible ladders in Donkey Kong’s Ramps level: There are more invisible ladders than the one demonstrated in Part 1, and these aren’t caught by traps! The current World Record recorded by the servers uses it, in fact, making it an essential strategy for anyone trying to beat it.
  3. Kirby Credits Warp: One of the levels in the game has a massive trick, where Kirby can get inside a wall, and if they have the Stone ability (possible to get with Mix), can crash the game, and if the Start button is pressed on the same frame as Stone activating, the NES cart jumps straight to the credits! The crash however takes the NWC software back to the selection menu, and the Start button is disabled, so this one’s impossible to do.
  4. Legend of Zelda moving through blocks: A frequently-used trick in speedruns, it’s not caught by the NWC software but there’s no place where it’s useful for saving time.
  5. Super Mario Bros. 4-2 Wrong Warp: This is an alternate way to get to the 8-7-6 Warp Zone without having to reveal the hidden blocks, then hit and climb the vine, by going down the coin pipe shortly after without scrolling the screen far enough to change the secret area destination. Seems to be impossible to make work in NWC, as the game rewinds when the vine block is scrolled off-screen.
  6. Super Mario Bros. 8-4 Wrong Warp: Done under similar conditions to the 4-2 wrong warp, this one is caught by the emulator and rewinds the trial.
  7. Surviving Timeout in Metroid’s Escape Sequence: If Samus uses the final elevator with the right timing at the end of the escape, the explosion happens, but she survives to complete her mission anyway. It’s possible in NWC, but results in the longest-possible time to complete the trial, so it’s only useful to show off.
  8. Super Mario Bros. 8-2 Bullet Bill Flagpole Animation Skip: If Mario bounces off of a low-flying Bullet Bill right at the end of 8-2, it’s possible to trigger the flagpole, but leave Mario before the block on which the pole rests. This results in him walking into it endlessly, but it triggers the level completion sequence, and means he doesn’t have to raise the flag or walk to the castle. It’s really only a slight time save, but it does work in the NWC version of the game.

Looygi Bros. Tests Glitches in Nintendo World Championships

Looygi Bros. obsessively plays various games and finds quirks, glitches and interesting facts about them. Their newest video tries out a bunch of known glitches in NES games and sees if they work in the new Nintendo World Championships speedrunning game. The result: in many, but not all, cases, Nintendo has put in code traps to make sure the games are operating as intended, and if they are set off, like if Mario goes through a wall or Link wraps around the screen, the emulator software declares Strategy Unavailable and resets the run. They tested 11 glitches in a ten-minute video, embedded here:

To summarize them:

  1. Minus World: the trap occurs when Mario tries to slide through the wall at the end of World 1-2.
  2. In Donkey Kong, it’s possible to climb down the first ladder, wrap around the screen, and end up on the girder right below the goal. They caught this one.
  3. Super Mario Bros. 2 (USA) Fast Carpet: with two carpets spawned, you can travel extra fast. This one didn’t get caught, but the set-up time to use it makes its use in the challenge prohibitive.
  4. Wrapping the screen in The Legend of Zelda. This is one of my least favorite glitches honestly. Nintendo caught it, you can’t glitch around the screen horizontally nor get Link into the top-of-screen status area. (I also dislike the term “HUD” for these areas. Dammit Jim, it’s a video game not a jet fighter.)
  5. The “door jump” glitch in Metroid. This lets you use a door to get Samus inside the blocks that make up the edges of the screen, from there you can, depending on the situation, either wrap around the screen vertically or explore “secret worlds” created by interpreting random cartridge data as terrain. This one’s trapped.
  6. Super Mario 2 double jump. I didn’t know about this one! In some circumstances when you’re near an enemy, characters can jump in mid air. This one is both not trapped, and actually useful in the challenge!
  7. Super Mario 3 Fortress skip. In similar circumstances to passing through the wall in Super Mario Bros. to get to the Minus World, you can pass through a wall midway through the fortress to skip an area and go straight to the boss. This one’s trapped, probably checking for the same kind of situation as the Minus World trick.
  8. Super Mario Bros. wall jump. Not trapped, and conceivably useful in the World 8-4 completion challenge to get into the elevated pipe.
  9. Kid Icarus fortress 1 shortcut. There’s a way to glitch through a wall early in the route through the fortress that takes you almost to the end. This one is trapped, but it’s triggered, not when you get through the wall, but when you go through the room’s exit. It probably makes sure you go through all the essential rooms in order.
  10. Super Mario Bros. 2 cave skip. It’s a way to glitch through a wall so you don’t have to wait for a bomb to explode. It’s tricky but possible, you end up taking damage to get through it though.
  11. Super Mario Bros. 2 item attachment. A complex trick that lets you get items into areas where they aren’t intended to go. Technically this is untrapped and usable. In conjunction with the cave skip trick, it’s possible to kill Birdo with a Shy Guy, potentially with one throw instead of having to wait for three eggs to throw back at her. Looygi Bros was unable to get the whole trick to work in the World Championships software, but offers the possibility of it working to whoever can chain together all the necessary techniques.

I find it interesting that the tricks were disabled through traps instead of fixing their games, they seem to have enough technical know-how to know how the glitches work to check for them in the emulation layer, but maybe fixing them was deemed against the spirit of the game, or they didn’t want to risk changing the game’s essential behavior?

Retro Game Mechanics Explains Mario 3’s Minigames

Let’s get the video embed out of the way first. Pow!

Super Mario Bros. 3 has two significant minigames (outside of two-player mode), and the inner workings of both are explained in this video.

In most worlds there are “Space Panels,” which provide a slot machine minigame for extra lives. If you’ve ever tried them, you might have noticed that it’s extremely difficult to win anything at it. Well, the video explains why that is: there’s a significant random element to stopping the wheels. In particular, the last wheel has so much randomness in when it actually stops that it’s actually completely random what it’ll stop on! So much for timing!

I have a theory (which I explain in a comment on that video) that the slot machine game was made so random because of the quality of the reward (it’s possible to earn up to five extra lives at it), and because they had played around with life-granting minigames before. Doki Doki Panic, which got reskinned for overseas markets at Super Mario Bros. 2, has a slot machine game, “Bonus Chance,” that appears after every level. With good timing and practice Bonus Chance can be mastered, earning up to five extra lives for every coin plucked in the level. I have managed to abuse that game to earn so many extra lives that the game ran out of numbers for the tens’ digit of the life counter, sending it into letters of the alphabet. There’s certainly no danger of that in Super Mario Bros. 3.

The second minigame has the player match cards from a grid of 24. Each pair of cards found earns a modest prize, from as little as 10 coins up to a single extra life. Most of the awards are powerups for the player’s inventory. The player gets two tries, but if they don’t clear the board it’ll carry over to the next time they play. Attempts at the card matching board appear every 80,000 points the player earns, making it the only Super Mario game to actually reward scoring lots of points.

The card matching game is one of the most interesting minigames in all of the Mario series. There’s only eight layouts for the cards, the second and fifth cards of the middle row are frequently both the 1UP card, and the last three cards on the bottom row are always Mushroom, Flower and Star, in that order. This means the minigame can be mastered, and even if you don’t memorize all eight layouts to deduce where the prizes are, knowing the three cards that never change usually means it won’t take more than two or three attempts to clear the board, netting lots of powerups.

Retro Game Mechanics Explained looks into why the card matching game works the way it does, and discovered some interesting things. There’s actually code in the game to do a much more thorough randomization of the cards, but it goes unutilized. The full details are in the video, but in summary:

  • The board always begins in the same state,
  • the last three cards on the bottom row are left unchanged, probably on purpose,
  • the first way the other cards are scrambled shifts them one space in sequence, and is only done one or three times, three times in total,
  • and the other method of scrambling them, which involves swapping around three specific cards, is done exactly once between each shift.

The only variation in the steps is from the choice of whether to shift once or thrice, each of those three times. Thus, there are only 23 possible layouts, that is, 8. There is a loop in there to potentially vary the number of times the cards are swapped (the second way to scramble the cards), but the way it’s written the loop is never used, and the cards are swapped only once each time.

All of the layouts for Maro 3’s card matching minigame, from the Nintendo Power guide. “The key is concentration” alludes to the traditional card game “Concentration,” which is played in a similar manner.

What I also find interesting is, this isn’t the only Nintendo to use a minigame that involves mixing up hidden prizes. Kid Icarus’ Treasure Rooms also have a limited number of layouts, which vary for each of the game’s three worlds. The player can open pots in the room to collect minor items, but if they open the wrong pot early, before opening all the others, they find the God of Poverty, and lose everything they’ve found. If they can save that pot for last, though, the final pot will instead contain a pretty good prize, which can even be a Credit Card item that cannot be obtained otherwise.

The way they’re designed, both Mario 3’s card-matching game and Kid Icarus’s Treasure Rooms have tells, specific spots that can be revealed to identify which of the limited number of boards that version of the game is using, and that the player can use to get all the prizes. Also, there are Nintendo-published guides that reveal all the layouts, in Nintendo Power for Kid Icarus (recounted on this charmingly old-school webpage), and the Nintendo Power guide for Super Mario Bros. 3 (on page 10), so Nintendo had to have been aware of the limited nature of the board layouts, and may have actually intended them to be defeated with a good strategy.

SMB3 Roulette & Card Matching Games Explained (Youtube, 20 minutes)