Terraria
Math
Anime
Chemistry
History
100

Killing this boss swaps the game to Hardmode and spawns in the hollow.

The Wall of Flesh

100
1+1

2

100

This anime features man-eating titans, who try to attack the remaining civilization of humans.

Attack on Titan.

100

This type of bond takes place between two non-metals.

Covalent bond

100

This explorers name is now featured as a common pool game.

Marco Polo
200

This is the most popular terraria mod.

Calamity 

200

This theorem proves that a2 + b2 = c2.

Pythagorean Theorem

200

This action and romance anime features golden balls and mythical creatures.

Dandadan

200
This is the charge of SO4.

-2

200

This leader spread beliefs of democracy around Europe through his expansion of the French Empire.

Napoleon Bonaparte

300

This former Moonlord drop is now sold by the Party Girl.

What is the celebrating. 

300

1+2+3...+99+100.

5050

300

This romance anime features an internal conflict surrounding liking each other, that is shown through trying to get the other to confess.

What is Kaguya-Sama: Love is War

300

This process occurs when a solid changes directly into a gas without becoming a liquid.

Sublimation

300

This Muslim traveler explored Afro-Eurasia and wrote his findings in A Gift to Those Who Contemplate the Wonders of Cities and the Marvels of Travelling.

Ibn Battuta.

400
The rarest item in terraria.

The Dirtiest Block

400

1, 1, 2, 3, 5, 8, 13, 21...

Fibonacci Sequence

400

This anime features a genius student and his class who are trying to become Class A.

Classroom of the Elite

400

This law states that for a gas at constant temperature, pressure and volume are inversely proportional.

Boyle’s Law

400

This traitor of the Americans during the revolution sold information to the British in a plot to surrender West Point.

Benedict Arnold

500

This special world's features aim to drastically increase the difficulty of the game.

For the Worthy

500

This Persian mathematician, writing in the 9th century, developed methods for solving quadratic equations and gave us the word “algebra.”

Al-Khwarizmi

500

This anime from 1988 features an intergalactic conflict between a democratic and monarchal society. 

Legends of Galactic Heroes

500

This type of reaction rate law depends only on the concentration of one reactant raised to the first power.

First-order reaction

500

This 11th-century event began after a speech by Pope Urban II and ultimately led to the sack of Jerusalem in 1099.

The First Crusade