Dragon Click mini-game:
Press L at the main menu. The words 'Dragon Click' will appear. Press R to play a mini-game where you hit R as much as possible.
After beating story mode, press L at the main menu. The words 'Dragon Player' will appear. It's a sound test that lets you play all the music from the game.
Unlocking Card Sheets:
There are five card sheets to unlock, one for each of the 5 chapters. To get them, you must get a Z rank on every fight in a chapter. Z rank is obtained when you finish a fight quickly, losing very little health.
Hold R at the character selection screen when choosing your character to start with them in powered-up mode. For example, selecting Goku will start you out as SSJ3 Goku.
|Adult Gohan - Super Saiyan Form
||Defeat Frieza in Chapter 1 - 8
|Adult Gohan - Super Saiyan 2 Form
||Defeat Broly in Chapter 2 - 6
|Cell - Super Perfect Form
||Defeat Cell in Chapter 2 - 5
|Goku - Kaioken Form
||Defeat Krillin in Chapter 1 - 2
|Goku - Super Saiyan Form
||Defeat Janemba in Chapter 1 - 9
|Goku - Super Saiyan 2 Form
||Defeat Fake Goku in Chapter 2 - 2
||Defeat Gotenks in Chapter 1 - 4
|Gotenks - Super Saiyan Form
||Defeat Gotenks in Chapter 1 - 5
|Piccolo - Fuse with Kami Form
||Defeat Cell in Chapter 2 - 1
||Defeat Janemba in Chapter 2- 9
|Vegeta - Super Saiyan Form
||Defeat #18 in Chapter 2 - 3
|Vegeta - Super Saiyan 2 Form
||Defeat Janemba in Chapter 2 - 7
||Choose the top path in the last chapter
||Choose the bottom path in the last chapter
||Beat story mode
Thanks to Revolution Readers mikea, matttt and Munching_Bag!