Earthbound
- The L button does lots of things. Check, talk, select; the L button does it all.
- When you ride a bicycle you can press the R button to ring the bell.
- There's a hidden clubhouse where a kid will give you a cap that's better than anything else available. It's by the library with a kid standing guard so it shouldn't be hard to find. It isn't significant, but every bit helps.
- Don't be afraid to experiment with strange items (toothbrush, ruler) in battles or boss fights. The Eraser Eraser in particular.
- Don't buy the seaside house in Onett unless you're swimming in cash.
- A couple PSI FavoriteThing trivializes the Titanic Ant fight.
- Give Paula all of the vitality capsules you find, she needs them the most.
- PSI Freeze has a chance to stop an enemy for a while.
- Fresh eggs will be a great source of income if you hold on to them.
- Once you get Jeff, feel free to stock him up with Bottle Rockets. He can't use PSI, so you might think he's underpowered. Bottle Rockets are key. Expensive, but worth the easy battles.
- Pizza is a heal-all item with three tiers, so calling Mach Pizza can be very helpful in managing the clutter in your inventory.
- The For Sale Sign is also helpful in getting rid of cheap items.
- The Brain Stone may sound useful, but it is actually glitched and does absolutely nothing. Keeping it in your inventory will only waste space.
- Use your phone for making deliveries and talk to mom every so often. Your inventory fills up with random junk all the time.
- Skip Sandwiches are costly, but moving faster is more rewarding.
- If an ally is dealt fatal damage in a fight, there is still time to heal them before their HP rolls to 0. To save time menuing, pressing AutoFight as soon as possible allows them to be healed quicker, hopefully with enough time to save them from fainting.
- There is an Insignificant Item in a drawer in Threed Hospital. Take it to the man in Twoson's Hospital and you'll be given a Magic Truffle!
- PSI Teleport can be used to make sudden turns if you are fast enough to control it. Take care not to go too far if you abuse it to run past fights.
- PSI Flash can cause lots of random ailments to enemies.
- Fobbies and Foppies are amazing enemies to grind on and only for a limited time.
- When you get to the Guardian Diggers, leave the third strongest one for last.
- In some rooms with a butterfly, leaving and re-entering will cause the butterfly to respawn.
- Lots of stuff that Jeff can use is repeatable and his Broken Bazooka becomes his greatest weapon after you fix it.
- Brain Food Lunch is favored by Poo.
- If you want to grind Ness to max level, wait until after defeating his nightmare.
- The total offense of every character factors when determining if you automatically win an encounter. Remove all your ailments first. You can win more encounters by equipping the ineffective Casey Bat.