Glad you got it, and I hope you liked it!

Good job!

large grids are random. You can print the input, but not sure how it would help... (maybe by drawing gthe points locally on a canvas...?)

I guess you're returning the wrong data type, but it's not visible in the assertion message because both translate to the same string, so:

• if you're returning tuples, return Nodes instead
• if you're returning Nodes, return tuples instead.