If you're not an iPhone user, this won't help. But if you do use iOs, the native Reminders app on the iPhone is absolutely perfect for this. I have different lists setup for tons of stuff... one for groceries, one for movies I want to download, one for a list of maintenance items for our boat, and most important one for "to-do" items for my pinball collection. The items can include maintenance/repair tasks, parts I need to buy next time I place an order, or even goals I want to accomplish in a certain game. Basically anything I want to remember.
To create a new list, click the + symbol next to the search bar at the top of the reminders screen or just say "Hey Siri, I want to start a new list". Name the new list "Pinball". An added feature if you have others with iPhones is that you can share this list with them (via iCloud) and they can add to it and mark items as complete. This works when my son is home from college and I can ask him to review the list and work on any outstanding items... or add anything he finds that needs fixing while playing any of the games.