You can get 2 free Ultimate Survival Trials by not completing Friday's and then activate Ultimate mode on Saturday and then complete it, refresh and then you get to complete Saturday's for free too

You can store Ranked/Space time rewards and Rescue Jin rewards indefinentally (well up to 90ish years) in your mailbox and claim them all at once if you need strange scrolls or are maxed

Never use your coupons if they are under 2k and u can't get a ninja or something else good.

Use 10 scrols everytime instead of 1.

Stack your coins for power up.