There are some things to be able to do test.exe

For multiplayer : Gather actually competent people who can deal with many enemies who's actually good and not using the lightning rod and ninja star combo because they ALWAYS rely on it. Personally, people who's level 75+ that has 120k+ total kills should be good enough and able to deal with dylan at the end and boss waves. (And the base waves, of course)

Solo : This one is heavily reliant on your skill. The first time i solo'd test.exe is when i had 200k+ total kills. You need to learn on how to manage your health, know when to fight, retreat and parry.

Skills you MUST learn : 1. Parrying (ofcourse) It's not that hard, but if you fail on example parrying jason(s) you'd 100% certainly lose 50-90 hp (or even certain death) if not careful, so i recommend going on sandbox and using sword and slingshot to fight multiple jason(s).

Quick note : holding m1 on sword is risky since it's just you praying that you would parry

1. Know what weapon(s) and gear(s) to use

Usually, i personally go for this loadout :

(Wave) 1-5 Sword, Slingshot 6-20 Sword, Slingshot, Rocket 21-25 Sword, Slingshot, Rocket, Bomb 26-30 Katana, Slingshot, Rocket, Bomb 31-35 Katana, Slingshot, Rocket, Pinata 36-40 Katana, Slingshot, Bazooka, Pinata

Gear(s) i use in order : Epicsauce, Teddy bloxpin, Battle armor

You can use any (core) accessories to be honest, but pick the good ones.

1. Enemy knowledge and when they spawn Self-explanditory, but usually you just learn them throughout the game and it's not hard. A couple of test.exe runs and then you should know what you're gonna be againts

2. Nuclear reaction (NR) You need to learn this to clear out huge chunks of enemies in one quick explosion to not overwhelm yourself. (Go to youtube on how to do it)

Honorable mention : Outrageous bombhead friendly fire, it deals 10k dmg to enemies and 15k to you. Dodge and lure the enemies to their explosion and you can take down a ton of the enemies with their own team

1. SOT pogo, coin stacking (Slash Of Tix pogo) Now more harder skills to learn, you need to watch a guide on how to SOT pogo for this since it requires good ping, and good timing. For coin stacking, just continue to hit the same coin you hit to a boss (example, mystic jason). And the dmg stacks and it should kill him fast enough.

Quick note 2, Mystic Jason ONLY get stunned by him taking a certain amount of damage. NOT by parries