wysteria
I see it, I see it now!
I will have to go to the SRB2 Wiki to do this, and I will also list them as the Wiki lists them, so here it is:
Single Player/Coop
Greenflower Zone 1 - 6/10
This is nice for a first level, but there is an area too cramped and it's too hard for me to pass through. I like where Tails' emblem is stored, but it's hard to access. I also like Sonic's emblem placement. It takes challenge to go there. I go to the higher bridge and spindash-thok to it.
Greenflower Zone 2 - 9/10
I like this level, but it's short for Coop as Sonic can speed thok through it. The Red XVI house is kinda hard to access for me because I'm not good at Crawla/Monitor bouncing and the red spring trick- I don't know where to go because of those walls. I couldn't find Knuckles' emblem, though.
Greenflower Zone 3 - 5/10
Kinda cool for the first boss. But the water, I don't get it. Why can't the 4 platforms get merged to one big platform and the water- maybe just a border to the platform. It takes time to get out of the water because you have to jump, and if needed, turn and find Eggman.
Techno Hill Zone 1 - 6/10
Okay. So I understand that this level has been contaminated with slime by Eggman. This level is like the introduction to the next level because it's like the entrance to Eggman's factory. And since you're entering his factory, you have to start off outside which is why there's grass and that slime pit with the metal island. I didn't like the little hole path though. It's hard for Sonic and Tails (as Tails may get tired of flying in the middle of the slime pit) but for Knuckles, he can climb his way out.
Techno Hill Zone 2 - 7/10
This level is probably my hardest to finish level (without Godding and using Level Select). Both ways are hard. Also, that Crawla Commander in the beginning. I think it should be placed somewhere else like maybe the room where the button to open the finish sign is.
Techno Hill Zone 3 - 5/10
I can't beat this boss without falling from the train thing using Sonic. Tails will also probably fail in going back to the train by flying because he can get tired. Knuckles has another advantage here- he can climb on the train and get back to Eggman.
Castle Eggman Zone 1 - 8/10
Another entrance and this time, to Eggman's castle. It took a long time for me to complete it because I couldn't find the button. I had this method with Knuckles that I will have to climb that wall on the left when there was a passage under the water. But the doorbridge isn't supposed to be a closed door and a bridge! The bridge is supposed to be taken away and if you push the button, the door should go down, forming a bridge.
Castle Eggman Zone 2 - 5/10
I don't like the button-pushing theme of the level, but it's the only way to get through. I don't like the pool in the center of the stage. It's kinda plain and maybe it could be turned into a fountain. Sonic's emblem is kinda hard. I'll have to go under a hole again and up like Tails' in GFZ1.
Castle Eggman Zone 3 - 5/10
This is the only boss (unless SRB2 is modified with a Mod) with enemies and it's hard trying not to hit the spike balls on the Eggmobile. But I like the setting. It's weird having 4 Red Crawlas only on the Normal mode, but having too many Crawlas in a boss mode will not fit. Overall, this is great for a final boss.
Secret Levels
Red Volcano Zone 1
I have been here only once. No other times but that. And I haven't finished it yet, so I don't know what's in here. But beating the levels three times using level select? I don't get it. If you use level select, can you just go to CEZ3 and beat the boss 3 times?
Sonic Into Dreams - Spring Hill Zone - 7/10
I have already unlocked this, but I only like going around this level, not actually playing it. I like how you can jump high and how Sonic can't drown because of it.
Mario Koopa Blast 1 - 6/10
This level is pretty cool except for the cave under the pipes. I don't know where to go, but I have finished it. It looks cooler in ShufflarB2, but it's harder since you can't use your abilities.
Mario Koopa Blast 2 - 5/10
The first time I played this was with a WAD file called MilesPrower. It's just a Tails WAD that's really fast and flies fast. So what I did was I kept on flying until the end. I just pressed the Right arrow key so it's just like being on a straight 2d level without enemies or other platforms.
Mario Koopa Blast 3 - 5/10
Same as above, using that character WAD, the level is, too, a straight 2D level until you hit the wall and fall to the Axe.
Christmas Hunt Zone - 5/10
This is pretty hard at first, but it gets easier because the emeralds don't go to different places so you can just remember where it is and the next time you play it, the emeralds are just where you first saw them.
Adventure Example Zone - 4/10
If only it wasn't an example I would love this! At first, I fell into that water thing but I mastered it. Knuckles is hard to control in this level. Other than that, this level is short, but since it's an example, it's meant to be short.
Special Stages
Special Stage 1
Special Stage 2
Special Stage 3
Special Stage 4
Special Stage 5
Special Stage 6
Special Stage 7
Circuit Stages
Quicksand Ruins Zone - 5/10
Sonic can just thok his way around which is unfair for other players in a Netgame. If all of them uses Sonic then they'd all be thokking which isn't that fair since Sonic is the fastest and he has a speed thok.
Tainted Gorge Zone - 5/10
Same as above.
Fertile Canyon Zone - 6/10
Since thokking is dangerous in this level, it would be fair to other players that use Tails/Knuckles. You can thok in some places like the beginning.
Toxic Citadel Zone - 9/10
This was cool except for that GFZ-themed bridge at the beginning. I like that this level has some places that you totally can't control the thok with. It wouldn't be fair that there are random monitors, because it can give you a liquid shield then the slime won't hurt you.
Frozen Night Zone - 5/10
You can't thok here therefore Knuckles has an advantage and maybe even Tails. But, if you can control your thok, you might be able to prevent falling from the water. Also random monitors also don't go here since it gave me an Inferno Shield which is useless since I'm on an ice level. I finished this 6 minutes and there wasn't a time where I didn't fall on the water.
Metallic Hall Zone - 7/10
I finished this level mostly by thokking, but I also fell into the "electric flashing ground" at some times. The random monitor is a challenge in Netgames because players want the Attraction Shield monitor which has 2 advantages (but to other players, are disadvantages) in this level:
1. It takes out all the rings leaving other players ring-less thus they lose a life when they fall on the electric ground.
2. You won't get hurt on the electricity.
But since it's in race, you can have a chance of getting ring tossed and you can lose your shield.
Heaven Pass Zone 5/10
Sonic users may not find this easy to play. I got a game over and ended up in GFZ1. Tails, however, works fine at this level. Knuckles users should be careful, too. I don't like those small platforms. They're hard for Sonic but Tails can fly over it and Knuckles can glide around it.
Sonic Circuit Zone 4/10
This level screams thokfest. It's too plain and what's with the dark area? I don't think that Tails and Knuckles don't fit in this level because Sonic can just keep thokking until the level is over.
Slumber Circuit Zone 8/10
I like this level, but I'm not good at NiGHTS. I haven't found anything wrong here. I like the zig-zag place thing underwater. I absoloutely love this.