100 Rooms of Enemies
100 Rooms of Enemies is a Pit of 100 Trials inspired SMW Romhack started by Daizo Dee Von where the goal is to get as far as you can to win by defeating every enemy in each room. The reason for it's existence is it was a hack that challenged the mindset that games without the ability to save progress are never fun, first argued during the original Touhou Mario by Wakana. It initially released in 2014 with v1.0.0. during Winter C3, and was rejected for the Fryguy boss clipping through walls, thus making the game unbeatable. MellonPizza joined development to fix the bugs found in v1.0.0. and so Daizo released the new v2.0.0. of 100 Rooms of Enemies in Summer 2015, and was since accepted. Ever since it's explosion in popularity in August 10th 2017 thanks to an upload by Blue Television Games, both Daizo and Mellon worked together to start work on "The Full Edition", later changed to "The Nightmare Edition" for it's inclusion of Nightmare Mode and it's many improvements and features. This update is still being worked on to this day.
Initial v2.0.0 Release
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v2.0.0. brought forth two versions of the game: Arcade Mode, and Do or Die Mode. It also fixes a few things that were brought in v1.0.0. which includes rooms with "bad palettes" changed to have custom palettes instead; the Fryguy boss being "almost" fixed, and Room 100's self lock being fixed.
Arcade Mode
Arcade Mode allows the player to have 5 credits to start, and each death brings you to the room you died in. Lose all of your lives, and you restart back from the title screen. This mode also brings in the ability to gain lives by finding hidden 1-up blocks that are scattered throughout all 100 rooms.
Do or Die Mode
Do or Die Mode is what it says in the tin: you have one chance to clear all 100 Rooms. You die, and you're sent back to the title screen to retry. You also cannot gain any lives, as the life count is stuck to 1 even if you bounce on enough enemies or collect enough coins to gain a life. This mode was first completed by levelengine save stateless.
The Nightmare Edition
There are many features that make The Nightmare Edition special. One such feature is instead of a seperate rom for each mode, both Arcade and Do or Die are packaged together in a single ROM along with the new Nightmare Mode. Along with this, many playable characters have been added as unlockables for completing the modes. On top of it all, it also tweaks old rooms and fixes cutoff established in all of them.
Arcade Mode
Along with everything established, there will also be a new feature added that allows you to skip rooms by finding "Special Rooms" found by completely specific rooms in a special way. There are 10 of these special rooms, all with various styles and ideas. Luigi is unlocked through this mode.
Do or Die Mode
Do or Die returns with everything established, but now it has a stopwatch for those who speedrun the game from beginning to end. Two characters are unlocked in this mode.
Nightmare Mode
The new mode of the game, where the player is tasked with completing each room with 5 credits again. This time, all the rooms have been "remixed" into harder versions of the originals to provide a much harder challenge. K-16 is unlocked through this mode.
Legacy
100 Rooms of Enemies was made at just the right time when people wanted a simple experience, and goes to show you don't need to be super "full of gimmicks" to be unique. Reception is also well received, baring comments about "Sonic music in a Mario Game" and "Bowser should be in Room 100 instead". A few fan sequels have been made, examples being 100 Rooms Oof Kek by Team Dicks and 10 Rooms of Enemies by Master Bluspark. Daizo Dee Von looks forward to seeing more by fans! It is also the second most downloaded ROM Hack made by Daizo, tho he thinks it'll reach to #1 fairly soon.
The first news that introduced the idea of multiple characters in 100 Rooms of Enemies was the official raocow talkhaus thread where Daizo occasionally makes progress on, and that was where Luigi and Demo were first revealed. It was later fully confirmed in a later C3 thread along with new info on what The Nightmare Edition brings. On February 14th of 2019, Daizo announced K-16's reveal in a video trailer in the style of Super Smash Brothers. No other news has sparked since...
As for when 100 Rooms of Enemies: The Nightmare Edition will be releasing? Time will tell...