Many companies big and small don’t have and usually don’t need the in-house talent, knowledge, and resources to solve some of their problems.
A website where companies can publish the problem they need to solve, and a prize for the first person or team that solves the problem. Anyone alone or as a team can apply and try solving the problem for the award.
For fun and to develop your mind.
A book about the general techniques, methods and theories for solving different kinds of puzzles. Should be comprehensive, teach the underlying methods and how they work and not just give solutions to specific examples of puzzles.