Tree of Life Sums

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Tree of Life Sums

Grow a new branch with every right answer. Grow a branching tree of life with quick mental math starring pixel Charles Darwin. Solve sums before each countdown runs out, build a streak and make the whole tree blossom in this free math game.

Twist: Three sums on the buttons make the target number and one does not: spot the odd one out.

Parody. Charles Darwin has no involvement in making these games and does not endorse them. The character is an original pixel-art caricature.

How to play

A target number appears at the top and each button shows a sum. Three of them make the target; one does not fit. Find that odd one out and tap it.
Tip: check each sum quickly instead of hunting for the right answer, since the one that does not match is the one you want. You get a bit more time than usual.
Answer with a tap or press 1, 2, 3 or 4. Every right pick grows a new branch on the tree, and quick picks in a row build a streak multiplier up to X4.
Choose a sum that does make the target, or let the timer bar empty, and the tree stops growing. The sums inside the buttons get harder as the tree grows.
Pause with P or Esc and mute with M. When the round is over, share your score with a friend.

Top 10 high scores

No scores yet: play a round and be the first on the board!

All-time top 10 scores in Tree of Life Sums
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The story

In his quiet study, pixel Charles Darwin has drawn a little sketch in his notebook: a single trunk that splits into branches, and branches that split again. Tonight the sketch has come to life on the wall as Tree of Life Sums, and it will only keep growing if he solves the sums it asks him.

Every correct answer sprouts a new branch, every streak makes fresh leaves unfurl and a single wrong answer stops the growth for the night. Complete the tree and it bursts into blossom from root to crown. Stop short, and the sketch will have to wait for tomorrow's notebook.