This robot goes through a maze using the right-hand rule, calculates the shortest route and returns along it. For payment, you can use Boosty. After purchasing, you will receive a package of files, including: Studio 2.0 assembly file, program written in the EV3G environment, comments in program with a detailed description of the work

Boosty (works in all countries)

I can tell you more in Telegram: @Irzkir