The game features a bonus gallery of concept drawings and other artwork. However, the majority of it can only be unlocked by fulfilling certain requirements in the main game.

Art #10 Get Rank A 20 or more times
Art #11 Get Rank A 36 or more times
Art #12 Beat Hard Mode with Kage
Art #13 Beat Hard Mode with Kage
Art #14 Beat Hard Mode with Chihiro
Art #15 Beat Hard Mode with Chihiro
Art #16 Jump 500 times
Art #17 Jump 1000 times
Art #18 Master all Ninjitsu
Art #19 Master all Ninjitsu
Art #2 Beat Normal Mode with Kage
Art #20 Master all Skills
Art #21 Master all Skills
Art #22 Pass Stage 1 in Expert Mode
Art #23 Pass Stage 2 in Expert Mode
Art #24 Pass Stage 3 in Expert Mode
Art #25 Pass Stage 4 in Expert Mode
Art #26 Pass Stage 5 in Expert Mode
Art #27 Pass Stage 6 in Expert Mode
Art #28 Pass Stage 8 in Expert Mode
Art #29 Pass Stage 11 in Expert Mode
Art #30 Pass Stage 12 in Expert Mode
Art #31 Parry 100 shiruken
Art #32 Get Rank S 10 or more times
Art #33 Get Rank S 20 or more times
Art #34 Get Rank S 36 or more times
Art #35 Beat Expert Mode using Kage
Art #36 Beat Expert Mode using Kage
Art #37 Beat Expert Mode using Chihiro
Art #38 Beat Expert Mode using Chihiro
Art #39 Perform 20 hits in a row
Art #4 Beat Normal Mode with Chihiro
Art #40 Perform 50 hits in a row
Art #41 Kage maxes Life
Art #42 Chihiro maxes Life
Art #43 Kage maxes Power
Art #44 Chihiro maxes Power
Art #45 Kage beats Boss Rush
Art #46 Chihiro beats Boss Rush
Art #47 Kage beats Boss Rush fast
Art #48 Chihiro beats Boss Rush fast
Art #5 Get Rank B 10 or more times
Art #6 Get Rank B 20 or more times
Art #7 Get Rank B 36 or more times
Art #8 Play for 2 or more hours
Art #9 Get Rank A 10 or more times

Unlock Sound Test, Boss Rush, Hard and extreme mode.

Hard Mode and Boss Rush Beat the game
Sound Test and Extreme Mode Beat the game on Hard