The answer in Elementdle is one of the 118 elements on the periodic table. It might be hydrogen. It might be oganesson, which most people have never heard of. You get six clues per guess and unlimited guesses. The good news is that the periodic table is a coordinate system: once you find the period and the group, the element more or less names itself.
The first three are green or grey. The last three tell you right or wrong and also which way to go. Those arrows are what actually drive the game.
104 of the 118 elements are solid at room temperature. Only two are liquid: mercury and bromine. Fourteen are gases: hydrogen, nitrogen, oxygen, fluorine, chlorine and every noble gas.
So a solid guess with a green phase tells you very little. A gas guess with a green phase drops you to 14 candidates at once. A green liquid means you're basically done.
Transition metals are the biggest category with 38 elements. Periods 6 and 7 are the most crowded, 64 elements between them. A good opener sits in a big category and close to the middle of the table.
Silver (Ag) is a solid choice: atomic number 47, period 5, group 11, d-block, transition metal. The number arrow splits the pool roughly in half. The period arrow tells you whether to look up or down, and the group arrow tells you left or right.
You only need the symbol in the search box. Type "Ag" and silver comes up. English, Spanish and Turkish names work too.
Period and group together point at a single cell of the table. So on your second and third guesses, play for those two rather than the atomic number. Pick a row in the direction of the period arrow, a column in the direction of the group arrow, and guess the element where they cross.
The atomic number arrow doubles as a check. If period 4 is green and the number says "higher", you're looking at the elements to the right of your guess on row 4.
The game counts lanthanides (57-71) and actinides (89-103) as group 3. If the block comes back f, or group 3 turns green on period 6 or 7, you're facing a row of 15. The group arrow is useless here. Binary search on the atomic number instead: try the middle one (64 for lanthanides, 96 for actinides) and halve the range by the arrow. Four guesses get you to the end of the row.
The right end of period 7 (nihonium, flerovium, moscovium, livermorium, tennessine and oganesson) can be the answer too. If period 7 is green and the group is somewhere between 13 and 18, think of these six. Most players never type them, which is exactly why they get stuck.
Opening a room and playing Elementdle as a class is a fun way to drill the category colours. Everyone hunts the same element. First to solve gets 3 points, second 2, third 1, and solving on the first guess adds 2 more. There's no guess limit, but points start dropping after 10 guesses, so listing random elements gets punished. That's when students start reading the arrows for real.
No accounts needed. The teacher shares the room link or writes it on the board, and students join with a nickname.