Metroid Prime

- Scan everything! Particularly things that either show up as a red scan point. A good chunk of your power ups will come from a scan that tells you it is made of x

- If you plan on doing a 100% items run, write down the names of the rooms where you get each missile/energy upgrade. You won't get them all yourself, and backtracking and having to remember which you picked up (or worse, which you may have picked up but then died and never saved) is a giant pain in the ass. It also helps if you grab the FAQ from Gamefaqs that has a checklist.

- All Missile and Energy Tanks make a distinct whirring sound when you get close, which happens even through walls.