What grade is Solid, Liquid, Gas for?

1st and 2nd grade. It’s a states of matter game with 5 levels that move up when your kid is ready.

Which standards does Solid, Liquid, Gas cover?

It lines up with NGSS science 2-PS1-1 and 2-PS1-4. Standards vary by state, so check with your kid’s teacher for the exact match.

Does my kid need to read to play Solid, Liquid, Gas?

No. Every question is read aloud, so kids who are still learning to read can play on their own.

How long is a round of Solid, Liquid, Gas?

About 10 questions, a few minutes. Nine right on the first try and the next round is a level harder; a tough round steps back one.

Is Solid, Liquid, Gas free?

It comes with every plan, from $7.99 a month, with a 7-day free trial. Number Garden and Gator Compare are free.

Science · Forces and matter

Solid, Liquid, Gas: States of matter, melting, freezing and changing back

In a kitchen lab, kids sort solids, liquids and gases, use clues to name a state, see what heating and cooling do (melting, freezing, boiling) and decide whether a change can be undone.

Grades1st grade, 2nd grade
Levels5, from “Solid, liquid or gas?” to “Can it change back?”
A roundAbout 10 questions, a few minutes
PriceWith any plan, from $7.99 a month

Try it free for 7 days See plans and prices

A round of Solid, Liquid, Gas on a phone

How Solid, Liquid, Gas works

Questions are read aloud, so kids who are still learning to read can play on their own.
A wrong answer shows why, with the picture or the steps, and then they try again.
Nine right on the first try and the next round is a level harder. A tough round steps back one.
Each game they play builds a spot in their own valley, and stars go in their sticker book.

The 5 levels

Solid, liquid or gas?
Clues
Heat it up
Cool it down
Can it change back?

What it lines up with in school

Next Generation Science Standards. Standards vary by state, so check with your kid’s teacher.

2-PS1-1: Sort materials by their observable properties.
2-PS1-4: Show that heating or cooling can cause changes, some of which can be reversed.

Practice it at home

Freeze water into ice and let it melt again, then talk about what changed and what can change back.
Watch steam rise from a pot or a hot shower and ask where the water went.

Questions about Solid, Liquid, Gas

What grade is Solid, Liquid, Gas for?: 1st and 2nd grade. It’s a states of matter game with 5 levels that move up when your kid is ready.
Which standards does Solid, Liquid, Gas cover?: It lines up with NGSS science 2-PS1-1 and 2-PS1-4. Standards vary by state, so check with your kid’s teacher for the exact match.
Does my kid need to read to play Solid, Liquid, Gas?: No. Every question is read aloud, so kids who are still learning to read can play on their own.
How long is a round of Solid, Liquid, Gas?: About 10 questions, a few minutes. Nine right on the first try and the next round is a level harder; a tough round steps back one.
Is Solid, Liquid, Gas free?: It comes with every plan, from $7.99 a month, with a 7-day free trial. Number Garden and Gator Compare are free.

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