Tōrō nagashi (灯籠流し) is a Japanese ceremony in which participants float paper lanterns (chōchin) down a river. The word tōrō is Japanese for lantern, while nagashi means "to cruise" or "flow". This is primarily done on the last evening of the Bon Festival, a festival based on the belief that these lanterns would guide the spirits back to the world of the dead.

Our robots are going to float their own illuminated lanterns down a river and watch how they flow down the river. Rivers in RoboLand generally have flat banks, sharp right angle turns and a consistent width throughout the length of the river.
Each Robot simultaneously put their lantern in a row spanning the entire width of the river. Each lantern...
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CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.