Level 3

Best online unblocked tetris

https://www.lumpty.com/amusements/Games/Tetris/tetris.html

PolyBranch

http://gregbatha.com/branches/

Osu

https://osu-mania.herokuapp.com

Candy Box

https://candybox2.github.io/candybox/

Infiniverse

http://tapiov.net/infiniverse/

Stairway to the moon

https://khaledsakr.github.io/stairway-to-the-moon/

Escape the dungeon

https://replit.com/@Ov3R10rd/Escape-The-Dungeon

Maze Game

https://games.wwwtyro.net/astray-2/index.html

Beware the space bears!

http://tapiov.net/7drl-2015/

Delta

https://sreechar.github.io/Games/delta/

Jurrasic world ascii

https://replit.com/@IcemasterEric/Jurassic-World-Online-Plane-Flights?v=1

Deaths dungeon ascii

https://replit.com/@InvisibleOne/Deaths-Dungeon-v2?v=1

Life in quarantine

https://sreechar.github.io/Games/quarantine/

Poor me more

https://tapiov.net/7drl-2019/#main

A dark room

https://wtool.org/adarkroom/

Gauntlet

https://sreechar.github.io/Games/gauntlet/

2 player TRON

https://sreechar.github.io/Games/tron/

Customizable tetris(allows a multiplayer aspect that is worth a go)

http://ondras.github.io/custom-tetris/

Omarshehata(strict 2 player one on pc one on phone)

http://omarshehata.me/html/ludum/

Minesweeper

https://testdrive-archive.azurewebsites.net/Performance/Minesweeper/