Mega Man 3D is a fan-made Mega Man (Classic) game created by lierinwait. The main things that differentiate this title from other classic Mega Man games are that it's a 3D platformer, has permanent life and weapon energy upgrades, and changes to the special weapon system. Some special weapons have infinite ammo, where others will drain the weapon energy bar upon use.
In the year 20XX. Megacity has lost contact with an unmanned asteroid mining base. The base's planet-splitter missiles have activated and are aimed at Megacity. Only Mega Man can reach the base via long-range teleport. Only Mega Man can save Megacity...
This game can be downloaded here 
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Mega Man 3D' provides examples of:
- Barrier Warrior: Bubble Man. He can create stationary bubble shields which can absorb a certain amount of damage. Once he's defeated, Mega Man can use this ability.
- Boss Rush: Surprisingly averted, considering the majority of other Mega Man (Classic) games having one of these in some manner.
- Deadly Disc: By defeating Metal Man, Mega Man obtains the Gear Shot. It's a long-ranged weapon with infinite ammo that fires gears or metal blades forward. These gears can bounce off of walls.
- Doppelgänger Attack: Gemini Man can create up to three differently-colored doppelgangers who will then attack Mega Man with a variety of elemental attacks based on their colors. These can be destroyed with sufficient damage.
- Down the Drain: The Water Storage area, where the water used for cooling the mining equipment is stored. As the name suggests, this area is filled with water and switches that can raise and lower the water levels.
- Dungeon Bypass: Due to a glitch, it's possible to clip through closed doors with the Quick Boost, bypassing several levels. It's even possible to complete the game with only two of the ten Robot Masters defeated.
- Emergency Energy Tank: Mega Man starts out with six L-Tanks (refills max life energy) and six E-Tanks (refills max weapon energy). He can find more scattered across the facilities and locations of Mega City. However, this is a limited non-respawnable supply. So, once one is used, it can never be recovered.
- Energy Weapon: The Power Overflow Regulator area has several rooms with Force Beams. Unlike their original appearance in Quick Man's stage, these are not instant-death. These quickly chip away at Mega Man's health reserves.
- Eternal Engine: The Machine Works, which is full of pistons and gears in the background. Also, the Waste Processing Facility which has electric beams and other technological components.
- Fragile Speedster: Quick Man takes double damage from most weapons.
- Frictionless Ice: The Cooling Unit area has friction-less crystals that carry Mega Man forward even after he stops/tries to change direction.
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Good Bad Bugs: As mentioned earlier, it's possible to clip through closed doors with the Quick Boost. Because of this, a savvy player can complete the game and avoid fighting 9 bosses they normally would have to. - Giant Space Flea from Nowhere: The Metroids and Giant Metroid in the second-to-last room and final boss fight. There were hints to a strange entity creating problems mentioned after defeating the first (directed) boss and after defeating the three Mega Man Killers. However, the development of Metroids specifically comes out of nowhere.
- Ice Palace: The Cooling Unit area, which has tons of crystals which act like friction-less ice.
- Kill It with Fire: Heat Man's repertoire of attacks are all fire based.
- Lava Pit: Technically molten slags of ore, but act the same way. These are present in the Smelter.
- Lethal Lava Land: The Smelter, with flows of molten ores and full of heat-type enemies.
- Mercy Invincibility: As in all Mega Man games, but there's no knock-back or flinching penalty for getting hit.
- Player-Guided Missile: Technically player guided laser. The Gemini Laser will curve in the direction that the player is turning.
- Playing with Fire: By defeating Heat Man, Mega Man gets the flamethrower. It's a short-ranged fire weapon with infinite ammo, and can quickly decimate enemies thanks to it's high damage output.
- Sequence Break: It's rather easy to ignore Dr. Light's orders and battle the 10 Robot Masters in any order, before even tackling the directed first boss.
- Space Episode: The entire game takes place on an unmanned asteroid mining base which has malfunctioned.
- Spikes of Doom: Subverted. Most of the spikes in this game deal a significant amount of damage to Mega Man upon contact. But, very few are instant-death.
- Spread Shot: By defeating Needle Man, Mega Man gets the Spread Shot. This is a long-ranged weapon with infinite ammo, that fires three pellets forward, forward-left, and forward-right of Mega Man. Because of this, it's a straight upgrade from the default Mega Buster.
- Temporary Platform: By defeating Tornado Man, Mega Man gets the ability to create mid-air floating platforms that last for a temporary amount of time. This is basically a 3D version of Item-1 from Mega Man 2.
- Videogame Dashing: By defeating Quick Man, Mega Man gets the Quick Boost. This utility allows him to dash forward for a certain amount of time. In fact, this will allow him to dash in mid-air without falling until the usage time is up. Even though it requires weapon energy to use, it becomes a Game-Breaker if the player has a large energy weapon energy capacity. This is because the player will be able to continuously use this utility, allowing them to basically fly through stages.
- Zerg Rush: The Tellies' main method of attack is to swarm Mega Man.
