At the beginning after you fight the man on the bridge, go underneath it. Look in the shack and see who is in there. Talk to him, say something like "What are you doing?". He will say "This is my home."
Easy kills
On the first part of the game on day 1, skip the bridge and go directly to the foundry. A man will talk about it. Attack him. You will then fight 100 men. You can do this as often as needed. This will help your money and your weapon.
Easy money
Join the Kurou family. Get about 50 yen fighting the man when you join the "family." You will get about 50 yen more for baby-sitting the kid. The night that Dona Dona goes to get the money from the residence, go to the girl, Suzu. "Rescue" Dona Dona. When you say you are on his side, he will call you a fool or something similar and fight you. Bring the safe with you to Suzu. When she sees that Dona Dona is not there, she will walk away. You can now get the 180 yen that was in the safe.
Easy points
Progress into the game and do the best you can, preferably under the hard difficulty setting. Once you make some progress, go to the train place and leave the pass. That is the easiest way to get points, and has the least cost in time. With it being in hard mode, if you get a good ranking you get a lot of points.
Eyes Flash
Hold L1 + L2 and rotate the Left Analog stick several times.
Funny Father Expressions
After you chase the man with the afro and the girl in the "Quick game completion" trick, walk behind the wall and talk to her dad.
Increase brightness (Japanese version)
Hold R1 and rotate the Left Analog-stick several in either direction. Your character's eye will begin to flash and will illuminate your surroundings at night. This can also be done during intermission sequences.
Increase sword hardness (Japanese version)
Pause the game, then hold R1 + R2 and press Right(7), Left, Down, Up, Square. The main player's currently equipped sword will increase in hardness by one. Repeat as needed to reach the maximum hardness of five. Note: This cannot be done in versus mode.
Increase Sword Hardness (US VERSION)
Hold down R1 and R2. Then push on the directional pad: right, right, left, left, down, up circle. The endurance of your equipped sword should be increased by one.
Light Up Your Surroundings (US VERSION)
Hold down L1+L2 and rotate the left anolog stick around and around. Your Samurai's eyes will flash and light the surroundings up.
More Than One Way To Win
There are 7 ways to win. 3 for the Akadama Clan. 3 for Kurou. And 1 for the government.
Restore health (Japanese version)
Pause the game, then hold L1 + L2 and press Up, Down, Up, Down, Left, Right, Square. Note: This cannot be done in versus mode.
Unlock Battle Mode
At the title screen, hold L1+R1, and press Circle and Square. This will unlock Battle Mode.
Unlock VS Mode (Japanese Version)
At the title screen, hold L1 and R2, then press Right and Square simultaneously.
VS Mode All Skills Available (Japanese Version)
During a VS Mode battle, pause the game, hold R1 and press Left, Left, Right, Right, L1, L1, L2, L2, L1, Right, Left. All the skills of the equipped sword will become available. During a 2 player battle, only the player that has entered the code will have all his skills. If you want both players to have all their skills, both players must enter the code.