It would be great to see a more detailed breakdown of solutions.

Easier to search for solutions based on a specific stack.

It would help people with light sensitivities and who prefer dark mode.

Small animations at specific points can add delight.

Challenge-specific Q&A would make for easy reference.

Add ability to create professional looking portfolio from profile.

Images and screencasts can enhance comments on solutions.

Stay updated on comments and solutions other people post.

Be able to bookmark challenges to take later on.

Sequenced projects for different goals to help people improve.

Screenshots of solutions with animations don’t display correctly.

Challenge preview images are missing when you apply a filter.