Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
Define the cost of a lattice point (i, j) to be i × j. A particle starts at (0, 0) and makes a series of 10 hops. Each hop increases the particle’s x-coordinate by 1 or y-coordinate by 1. Let the price of the particle’s path be the sum of the costs of the lattice points it meets, including (0, 0) and its final position. Find the maximum price of any path the particle can take.
Latest: 
Bonus: 
