During a battle, while highlighting an empty square, press Down, Left, Up, Right, A, Left, Up, B, Down, Right, A, B, Down, Right, A.
Inventory Trick
When a character class changes, he or she still retains any items equipped. You can use this to your advantage. For example, say your Elwin started as a Fighter. Fighters can equip Speedboots, but Knights can't. If Elwin has speedboots equipped and class changes to SlvrKnt, he will still have the speedboots equipped, even though SlvrKnt cannot equip speedboots. Note: You can use this trick in conjunction with Runestones and Scout classes to equip ranged weapons.
Multimedia Test
Go to the Load menu and place your cursor on any save slot, with a save in it. Press left, right, select, A.
Scenario Select
Go to the Load menu and place your cursor on any save slot, with a save in it. Press up, down, up, down, left, right, select, A.
Shop Two
On the Buy screen, press Left, Up, Right, Down, Right, Up, Left, Select, Down, Right, Left, Select, A.
Special Shop
Press Left, Right, Right, Down, Right, Up, and A while highlighting the 'Buy' command.
Starting Items Trick
When saying ''No'' to ''Is this okay?'' during character creation, all stats are reset except starting Items. Doing this, you can obtain many items from the start of the game such as Devil axes, saleable for lots of P. Though after the 6th time, the game freezes. So don't get too greedy.
Control Enemy Units...