Tag: rockman

Obscure Facts About Classic Mega Man Games

RollingCutter over on Youtube has compiled two videos, so far, of unusual and unexpected facts about classic Mega Man titles. First I link the videos (here’s the first, and the second), then some of the more interesting facts from them:

#1 (10 minutes)

#2 (15 minutes)

So, some (but by no means all) of the interesting facts they revealed:

  • In Mega Man 2, most of the Robot Masters get healed if you use their own weapons against them (with the exception of Metal Man, who dies in two hits to his weapon).
  • With the exception of Mega Man 3, the paths drawn on the map screen between levels of the multi-part Dr. Wily stages roughly match the routes you take through them.
  • In Mega Man 10, there are three boss fight rooms between drone enemies that match the weapons and behavior of past bosses from throughout the series. The lit boxes in the background of the fight generally correspond to the numbers of those bosses. For example, the drone that matches the behavior of Elecman, DLN #8, lights up the 8th of those background tiles, counting left-to-right from the top of the screen. Watch the first video for details.
  • Mega Man 6 has two instances (one described in each video) where two elements in a stage are linked. In Flame Man’s stage there are oil pools that light up and become deadly if struck by fire from enemies. But one pool late in the level is sometimes already on fire when you reach it. It’s because its state matches that of another oil pool earlier in the level: if that oil pool gets set aflame, then it’ll be on fire too. And in one of the Mr X stages later on, there are balance platforms in the level that match the state you left the same kind of platforms in in the room before.
  • In Mega Man 7, the cloud platforms can be frozen or electrified by your weapons. If electrified, they’ll do damage to you for a short time.
  • Hitting Heat Man with the Crash Bomber (MM2) heals him and speeds him up. Hitting Spring Man with thunderbolts repeatedly eventually causes him to glitch out and make the level impossible to finish. (You have to use around three full weapon tanks of energy to do it.)
  • In Mega Man 3, you usually can’t pause the game while a weapon’s bullets are onscreen, either your default Mega Buster’s shots or those of a special weapon, but they didn’t implement this check when firing shots when Rush is onscreen. If while Rush is onscreen you fire shots, then switch to another weapon, the Buster’s shots will have the properties of the weapon you switched to. In certain places (depicted in the second video) this makes certain enemies must easier to defeat.
  • In the Copy Mega Man fight in MM3, where there’s one true boss and two fakes, the first time they appear the top one is always the real one; when the bosses teleport out and back in, the real one always appears one frame before the others.
  • In Mega Man 2, if you pause the game while Wood Man’s in the middle of a jump, the boss will immediately jump again in mid-air.
  • In my opinion the highlights of the series so far. Mega Man 3 has debug features left enabled in the game, that can be operated using the second controller. This is the reason for the generally-known trick (from Nintendo Power) where you can make Mega Man jump super high, even in the air, using the second controller. And in Mega Man 1, if you’re very high up on the screen in a specific place in Ice Man’s stage (above the score), and jump and quickly move back and forth at the top of your jump, the game can glitch out in surprising ways. The second video has several examples, such as the game resetting or crashing, messing up the palette or graphics, or even immediately starting the Yellow Devil boss fight with incorrect graphics.
  • There are certain bosses throughout the series where it’s possible to land a hit on them while their energy bars are filling at the start of the fight. In some cases this results in weird behavior, but in Mega Man 7, you can destroy Spring Man and Turbo Man before the fight starts this way. (Cloud Man can also be damaged this way, but it might cause the game to glitch out.)

Displaced Gamers on Mega Man 3 Glitches

A bit of scanline flickering is a fairly common problem on the NES. Even Super Mario Bros. 3 had it, and that game was made by Nintendo themselves.

Game graphics in the 8- and 16-bit ages often came down to tricky hardware manipulation. The art of doing raster effects, changing the registers in the video hardware so as to divide the screen into different sections, ultimately comes down to timing. On the Atari VCS/2600, nearly all the graphics had to be done that way, but it was still a useful technique for over a decade after that.

A lot depends on the specifics of the video chip, a custom-built piece of silicon developed for the express purpose of taking graphics defined in memory and folding it, like electronic origami, into a shape that the TV would perceive as a broadcast signal. At that time, while it might still have been possible with clever coding, CPUs weren’t nearly fast enough to do that job themselves and still produce acceptable graphic quality and run game logic. (If you want to see what it would be like, I refer readers interested in doing it the very hard way to the amazing Freespin demo, which runs on a 1541 disk drive, and no video hardware at all.)

Older NES games used a supported bit of hackery called the “Sprite 0 Hit,” a signal the PPU would send at the moment the first of the system’s 64 sprites began to be drawn. By watching for it, games could do rudimentary raster effects on a system not designed for them. The issue there was processor time: the Sprite 0 Hit feature wasn’t hooked up to an interrupt line, so the program had to continually watch for it, checking a memory location repetitively over and over until it changed. Some games spent large portions of their runtime in a tight loop checking for the Sprite 0 Hit. Since, from the program’s perspective, the signal might come at any time, the loop needed to be tight, meaning the game couldn’t spend that time doing other work or else it might be delayed in responding to the extremely time-sensitive signal.

The MMC3 mapper had a special function though that could time out when a programmable scanline was reached, and send the processor an interrupt request at that time, greatly freeing up the processor for doing other things with that time. But not all programmers understood the best way to use it, which is why Mega Man 3 has some scanline glitching in a couple of very visible places, in the pause window and on the level select screen.

Displaced Gamers’ Behind the Code series, which we’ve linked to multiple times in the past, has done an exposé looking into how Mega Man III’s glitches happen (28 minutes), and even wrote some code that erases all trace of them. As usual for Behind the Code, the explanation is fairly technical, especially of the fix, but the first half of it is fairly comprehensible. No one says you have to watch the whole thing. Or, indeed, any of it, but I always enjoy them!

Mega Man’s Score System

Looks like we’re on another Youtube binge, ayup ayup. This time it’s another hopeful video constructor asking us to consider the oddity of the score system in the original Mega Man (a.k.a. Rockman).

When you post as many Youtube videos as I do, it’s easy to form opinions about their style. That of “TheRetroDude,” as he styles himself, is interesting, it’s still hyper-edited in the way that so many Youtubers loathsomely adopt, but it’s not nearly as distracting as those. He keeps the volume down, as well as the number of swoopy objects tearing around the screen like a toddler newly introduced to Toblerone.

He has good points about how extraneous the game’s scoring system is too, although his misgivings could be laid against many other games. In Super Mario Bros, score is mostly a spacer before toppled turtles start giving extra lives. I think that score isn’t a bad addition to a game as long as it’s implemented thoughtfully, yet for too long it hasn’t been. Even in the NES days it was included to give players a short term goal to aim for, when they didn’t really need it.

What would a good scoring system look like, one that rewarded skill? Well–

  • Losing a life would reset score to that at the last passed checkpoint, eliminating point pressing from lives.
  • Extra lives at game end would be worth a bonus each.
  • Game timers are worth a small, yet substantial, award at level end, to prioritize fast play over slow.
  • Awards should be given for score, most typically extra lives, but others are possible too.
  • Replaying levels, and other means of “minting points,” earning arbitrary scores, should be ruthlessly eliminated. If the player can replay levels indefinitely then think about if your game really needs a score, and if it does, don’t allow players to earn more points from replaying them without costing them the points from that last pass.

Two games that come to mind that do scores well are:

  • ZANAC on the NES, being a scrolling shooter without checkpointing score is generally fair, although it is possible to warp backwards does break the no-replay rule, and
  • Star Fox 64, which only adds a level’s score to the player’s total at its end. SF64 is a game obviously designed around score attacks.

Where was I? Oh! Here is that video about Mega Man’s scoring system.

Mega Man 1’s Really Weird Score System (Youtube, 9 minutes)

zandravandra’s List Of Mega Man Romhacks

It’s too light to make it an official Romhack Thursday post, but it is Thursday, so…. or rather, it was, yesterday, when this was slated to go originally, except Fully Ramblomatic premiered and I figured I should strike while that iron was hot. This iron, after all, is more malleable at lower temperatures.

Alex Zandra on Mastodon, @zandra@mastodon.social, who is @zandravandra on Cohost, put together a list of her favorite Mega Man romhacks that looks pretty interesting.

The games are (in order through the series): Mega Man Speed Bomber, Rollchan No Constancy, Rollchan At The Tokyo Olympics, Mega Man 4 Voyage, Mega Man 5 Double Jumper, and Rockman 6 Spirit of Hackers. The closest I’ve come to playing any of them was Rockman No Constancy, before Roll was put into it. There are lots of hacks that are difficult even to play, so curated lists of them are very useful!

Alex Zandra’s list of Mega Man Romhacks (cohost.org)