Treasure Island: an angles, area and coordinates game for the 11+

About Treasure Island

Treasure Island is an 11+ geometry expedition across a treasure map drawn on a coordinate grid. A round is 14 questions: three stops in each of four regions, where every right answer turns up a find, then the Final Dig in Treasure Hollow. Each region leans on one topic, and the Final Dig’s two harder clues go first to any topic the round has not covered yet.

A wrong answer sends the expedition off course: the game names the trap, shows the right answer, and then the map shows the way to the next stop. The tide clock only sets a bonus and never ends the game. Questions get harder after three right in a row and easier after two misses in a row, and the expedition review works through every trap.

How to play Treasure Island

1. Choose your seas (Calm Seas, Trade Winds or Stormy Seas) and press Set sail.
2. Answer each question to march your flag to the next stop; the quicker the answer, the more gold you find.
3. Get three right in a row to win the Golden map, which doubles your gold until a miss.
4. Beat the tide for bonus gold: the tide clock only runs while a question is open and never ends the game.
5. Finish with the Final Dig: two harder clues for double gold, then dig up the treasure where X marks the spot.

What it practises for the 11+

Angles

Measuring angles and working out missing ones on a straight line, around a point, in triangles, quadrilaterals and regular polygons, with parallel lines, clock hands and compass turns. For example, angles on a straight line add up to 180°, so if one is 65° the other is 115°. Learn the topic →

2-D Shapes

Knowing the properties of triangles, quadrilaterals, other polygons and circles, and sorting shapes in Venn and Carroll diagrams. It builds exact shape vocabulary, e.g. every square is also a rectangle and a rhombus. Learn the topic →

Area and Perimeter

Finding the distance round a shape and the space inside it, from rectangles on squared paper to compound shapes, triangles, parallelograms, trapeziums and circles. For example, a 6 cm by 4 cm rectangle has a perimeter of 20 cm and an area of 24 cm². Learn the topic →

Coordinates

Reading and plotting points in all four quadrants, moving and reflecting shapes on a grid, and finding missing corners and midpoints. For example, (2, 3) moved 4 right and 1 down lands on (6, 2). Learn the topic →

Symmetry

Finding lines of symmetry and the order of rotational symmetry, and completing shapes and patterns in a mirror line. For example, an equilateral triangle has 3 lines of symmetry and rotational symmetry of order 3. Learn the topic →

Try Treasure Island questions

Questions from the game, for you to try together. Have a go before opening the answer.

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