Like many first person shooters with different weapons, Mega Man 8-Bit Deathmatch has it's fair share of game-breaking weapons.
- Top Spin, considered one of the worst weapons in Mega Man 3, is now one of the best weapons in this game. The fact it can tear any player's health bar is enough for it to be game-breaking.
- Napalm Bomb is exceptionally good against the AI in Flash Man's stage, which makes getting to Enker's fight much, much easier - most of the opponents will be fighting it out in the middle of the stage, making it easy to just spam bombs into that area and get a lot of easy kills. In general, if a map is fairly open and causes a lot of group fights amongst the AI, explosive weapons tend to get a lot of easy kills.
- In another case of a Scrappy Weapon being turned into a game-breaker, there's the Plant Barrier, which can now heal you while it's active.
- Slash Claw. Despite being nerfed, it can still pack a tremendous punch, killing any bot in at least 2 hits.
- Astro Crush. Simply put, if anyone uses it in a crowd, expect a lot of damage.
- While Remote Mine is balanced when fighting human players, it becomes this in the single-player campaign, as the AI has no idea how to fight against it. It makes most maps it's on much easier to beat, especially the fight against all 8 of King's robots near the end of chapter 9.
- Flash Bomb falls into a similar category. Bots don't seem to register the lingering explosion, so they'll happily walk all over it, taking tons of damage, as long as it keeps you on their sights.
- Black Hole Bomb. Aside from it being controllable, it can sap a lot of health from those who get sucked into it. Crowded bots won't be able to escape from BHB that easily, so expect to rack up a lot of frags quickly.
- Electric Shock. A serious weapon that can zap anyone's health quickly with a moderate energy consumption to boot.
- If you defeat Punk in Chapter 4, you get access to the Screw Crusher for the rest of the chapter, and it is incredibly useful, being a fantastic fire-and-forget weapon that uses up very little energy per shot and can be easily spammed while either running away, over cover, or into an area where your enemies are fighting, or just down a narrow corridor if you really want to make the lives of bots utterly miserable. While short entryways are something this weapon handles poorly, you don't need any other weapon to be effective for the rest of the chapter. As for the other two Mega Man Killer weapons, Mirror Buster is very much a Difficult, but Awesome, and Ballade Cracker can be fairly effective, but not as consistently as the Screw Crusher, and has a much higher energy cost.
- Drill Man as your companion in Pluto's stage in Chapter 13 is probably the most reliable teammate out of all of the Cossack robots, bordering on Hypercompetent Sidekick levels. While he's not invincible, he can hold his own against entire groups for a bit, and if you keep him alive, chances are his unlimited-ammo explosive Drill Bomb will possibly net him most of the kills while you're trying to stay alive due to only having one life available. He won't be able to solo Pluto, however, so keep that in mind (though a well-placed Black Hole Bomb will allow you to keep Pluto at arm's length and allow Drill Man an easy shot at the Stardroid... Most of the time). But in any case, having him makes Pluto the best planet to farm bolts.
- Get the unlimited-use Rush Search as soon as you can in Chapter 13 - 999 bolts isn't that hard to get, and Rush is extremely helpful for digging up weapon energy capsules, basically giving you functionally unlimited energy for any of the above game-breaking weapons. Or just health capsules, which aren't a bad thing to have spares of at any one time considering you're limited to a single life. Even if you dig in the exact same spot, Rush will always find at least one of the four random capsule types, and they'll all come in handy one way or another.
- The Dawn Breaker is an intentional example; In order to even obtain it, you have to solve Pharaoh Man's riddles in order to find 8 relics, then use them to open an ancient temple and defeat Ra Thor and Ra Devil. The weapon itself has absurd range, deals heavy damage, homes in on enemies to an extent, and on top of that has a charge attack that can even tear Terra to shreds if used at the right time. However, it's exclusive to Chapter 13, and doesn't spawn as a pickup in any map.
