Combine

Mix two species, balance every atom, and chain your discoveries to the goal.

How to play

Combine two species to form new compounds, with one strict rule: a reaction only works if every atom is conserved. Build a tree of discoveries from your starting set and reach the target compound.

• Fuse two species to attempt a new compound
• Only mass-conserving, balanced reactions are accepted
• Add each successful product to your bank of discoveries
• Reach the target species — faster solves and more finds score higher

Game modes

• Easy, Medium or Hard difficulty
• Daily goal or Practice for fresh targets

Controls

• Desktop: drag and click to pick the two species you want to fuse
• Phone & tablet: tap or drag to select and combine species

Tips & strategy

• Count atoms on both sides before committing — unbalanced pairs just fail
• Build versatile intermediates that open several later reactions
• Watch the timer and chase the chain that leads most directly to the target

What you'll learn

Combine is a chemistry crafting puzzle about reactions and compounds, with conservation of mass as the rule you cannot break.

• Skills: chemical reactions, compounds, conservation of mass, chemical formulas
• Best for: roughly grades 8–12 (ages 13+)
• For parents & teachers: reaction chemistry through hands-on combining.

About Combine

Combine is a chemistry crafting puzzle about reactions, compounds and conservation of mass. It's an original, free browser game made in-house for PlayPendium.

A free, original browser game on PlayPendium — no download, no install. Browse all games →