Generally speaking, there should be only one best solution for solving a problem. But sometimes, there may be several best solutions from different perspectives to solve a problem. We would like to post all the solutions for users to choose which one to use.
Posted best solution only means the best solution at the current moment. But if you find a much better solution than the current one, you can challenge the current solution by submitting a new one by referencing the old solution. The person, who has successfully challenged the current best solution, will get 100 Contribution Points.
Sometimes, the Blue Eden Project team may post some wanted problems on the top of specific forums. The person, who has successfully solved the wanted problems with best solutions, will get 100 Contribution Points. Please reference the wanted problems in your submissions.