What should I build during a 40-day break to gain real software experience?

A text-based adventure game is a good way to practice OOP without getting buried in infrastructure. You can model rooms, items, commands, players, and game state, then improve it with save files, tests, error handling, and a clean command-processing design. The important part is treating it like a real project rather than just writing everything in one file.

Several small, finished projects are probably a better fit for 40 days than one ambitious system. Pick a project, write down its features, and then deliberately cut the list down until the scope is manageable. Finishing a few focused projects will teach you more about planning, iteration, and cleanup than ending the break with a large unfinished codebase.

A small web application could also be useful, such as a login and sign-up service or a personal tracker. Choose one language and framework, use version control consistently, write a short plan with user stories, and deploy the finished result somewhere. Reading documentation and debugging issues yourself will be more valuable than blindly copying generated code.

You could also build a practical route-planning project. Start with a graph and a shortest-path algorithm, then add factors such as travel time, congestion, or user preferences. This gives you a concrete reason to apply your data-structures knowledge while learning how to design an interface, manage input data, test edge cases, and separate the algorithm from the rest of the application.

Build something that solves a problem you actually have or would genuinely use. That gives you a reason to handle the parts coursework often skips, such as persistence, file I/O, validation, error handling, configuration, and changing requirements. A small local file-sync tool could work well because it introduces state management and practical constraints without requiring a full cloud platform.