All upgrades are free.
The ninja must avoid all obstacles and traps. there are several styles of ninjutsu to help you achieve your goals and get all the achievements. There are 4 kinds of ninjutsu styles, 13 kinds of achievements and more then 7 kinds of upgradeable items with 3 levels of upgrades for each item.
Control in Game: -slash : left click button or “S” -jump : space bar