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Funny money brainteaser Brainteaser

by David, 16 June 2021 | 0 comments

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Difficulty: Tricky Clare and Jeremy just finished a job overseas, on Dough Island. They received the following as payment, in the island’s currency: A $3 coin A $4 coin A $6 note An $8 note and A $9 note. Clare and Jeremy want to share the money so they both get the same number of…

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Video views brainteaser Brainteaser

by David, 3 June 2021 | 0 comments

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Difficulty: Tricky Gordon is trying to make it big with his Minecraft-themed parody song channel. He spends a lot of time working on each video, and he wants as many views as possible. Gordon’s noticed some patterns with his view numbers:

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Swap the blocks Activity

by David, 26 May 2021 | 1 comments

Six squares drawn in a grid, two end squares are coloured, one red, one blue. There are tiles on five of the six squares.

Here’s a puzzle that’s easy to set up, but surprisingly tricky to solve. See if you can swap two counters just by sliding them!

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Idir’s tiles brainteaser Brainteaser

by David, 20 May 2021 | 1 comments

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Difficulty: Tricky Idir was in the bathroom when he noticed that the tiles weren’t all the same shape! Instead, there were two different shapes of tiles.

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Secret Roman brainteaser Brainteaser

by David, 6 May 2021 | 0 comments

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Difficulty: Tricky Can you take 2 from FIVE and leave 4?

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Hydra heads brainteaser Brainteaser

by David, 22 April 2021 | 0 comments

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Difficulty: Tricky While out adventuring, Heracles the Hero came across a monstrous, 9-headed Hydra. Without pausing to think, Heracles pulled out his sword and started cutting off the Hydra’s heads. After several minutes of cutting, Heracles realised it was taking ages to remove the heads. Then he remembered something his friend Euripides told him.

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Half a thousand brainteaser Brainteaser

by David, 13 April 2021 | 0 comments

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Difficulty: Fun Can you add one symbol below to make half a thousand? 5 5 5 5 5

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Dust mite dilemma brainteaser Brainteaser

by David, 31 March 2021 | 0 comments

Crosshatched page with arrows and numbers in different directions.

This brainteaser comes from our new book, Puzzles and Projects. This book features some of the best puzzles, hands-on activities, stories and more from Double Helix magazine. Plus, there’s stacks of new content to explore! You can buy a copy on the CSIRO Publishing website, or pick it up from your favourite bookstore!

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Easter activities Activity

by David, 25 March 2021 | 0 comments

Hand holding a transparent egg shape orb.

Are you looking for some fun activities to fill your Easter break? Check out these seasonal suggestions!

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Giant golden cube brainteaser Brainteaser

by David, 12 March 2021 | 4 comments

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Difficulty: Tricky Sian is making a big, shiny cube in Minecraft. It will be 10 blocks wide, 10 blocks deep and 10 blocks high. The outer layer of blocks will be made of gold. Everything inside the cube will be made of obsidian. Will Sian need more gold blocks, or more obsidian ones?

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