Can you follow the clues and find Captain Gridbeard’s hidden treasure? In this puzzle, you’ll explore a mysterious island by clicking points on a coordinate grid. Each clue sends you to a new location, but you’ll need to think carefully about coordinates, translation vectors, midpoints, gradients, lines and distances.

Your aim is simple: find the treasure in as few attempts as possible. You can use the hints if you get stuck, but every checked location counts as an attempt — so choose your coordinates carefully before you press Check Location.

Start with Explorer Mode for the safer route, or try Navigator Mode if you’re ready for sneakier clues. Good luck — the treasure will not dig itself up.

Note for teachers / tutors: You might want to print some cartesian grids from -10 to 10 (for workings)