The treasure hunt is a series of online mathematical challenges.

If change ringing involves a mathematical challenge, installing the change-ringing bells at Trinity involved an architectural and engineering challenge.

For many years after Penrose's foundational 1967 paper, twistor theory progressed slowly, in part because of mathematical challenges.

The engine was well engineered, with a counterweighted crankshaft (quite a mathematical challenge at the time), overhead valves, and hydraulic tappets.

One example of such a mathematical challenge is the Riemann hypothesis which is currently an unsolved problem.

There are several professional organizations that collect various unsolved math problems and present them as mathematical challenges.

Curved origami also poses a (very different) set of mathematical challenges.

One of the most important mathematical challenges of chess is the development of algorithms that can play chess.

All these strategies have the potential to involve all pupils in mathematical challenge, enabling them to engage in a broader curriculum.

Early work on Cosm lead to the co-founding of distributed.net which cracked multiple cryptographic and mathematical challenges beginning in 1997.