Semi, Bi & Tri: build words with semi-, bi- and tri-
🌟 You're finding some brilliant words!
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Ready?
Do you want to watch one word being built first?
Word Bank
Hint
Not in our word bank
How to play
Add prefixes and suffixes onto the base word to build as many words as you can.
Finding words
The dashed spaces in the Word Bank show how many words you need to build. Every new word you make pops into one of them. Wider spaces are waiting for longer words made of more parts!
react
Endings like -s, -ed and -ing
These make a new form of a word you've already found — not a new word. So react, reacts, reacted and reacting all stack up in one place: each form tucks in behind the word, and a little +1, +2, +3… counter shows how tall the stack has grown. Tap any word in your bank to open its card and flip through the forms you've collected.
react+3
Complete a stack!
Collect every form of a word and its stack earns a shiny ring — and the biggest stacks set off a celebration too!
react+4
Rare words
A few extra-special words are hiding on every board. Build one and it gets a gold star ★ and a celebration all of its own. Rare words aren't part of your goal — they count on top — so a rare find can even take you past it. Hints will never give one away: you have to discover them yourself!
reactor★
Stuck? Use a hint
Tap Get a hint next to your goal and we'll tell you the meaning of a word you haven't found yet and light up the prefix it needs — you work out the rest! You get three hints a game, and you need to build each hinted word before the next hint unlocks.
When every space is filled
You've done it! You can finish there — or keep going. There are often more words hiding — rare ones too — and every extra word you build pushes your score higher on the leaderboard!
Spelling clues
Sometimes the spelling changes where two parts join. Watch for these:
nDouble letters — a letter is added and highlighted in yellow (e.g. run + ing → running).
eOmissions — a silent letter is dropped and shown crossed out (e.g. elevate + ion → elevateion).
yiy → i — a y changes to an i, shown in yellow (e.g. carry + es → carries).
iVowel connectors — a joining letter highlighted in blue glues the parts together (e.g. therm + o + meter → thermometer).
Which spelling is right?
Finish playing?
You've found 0words so far!
Prefixes: semi · bi · tri
semi- means "half", bi- means "two" and tri- means "three". Pick the right one for each base word!
Medal target: 12 different words
Remember to take a break
You've played 20 games — nice going!
Why not rest your eyes, stretch your legs and have a drink of water? Your llama will still be here when you come back.
Word Bank
Medal target: 12 different words
