The Bank is an important resource that becomes available after the twenty level, it can store items that can be exchanged between files. Normally it costs gold to be able to withdraw from the bank however if you deposit the item into the bank from a file and then do your runs on that file you can withdraw from the bank at no cost.

There are three items that should be in your bank.

Gayan Max Star - Best weapon in the game, (so far) for speed running, greatly increases your speed and deals the most damage out of all daggers.

Improved Jump man Suit - This is a significant upgrade over your other equipment and allows you to perform so sequence breaks.

Steelblow Ring - After experimenting with level 25, personally my least favorite level in the game due to the amount of unskipable cut scene I found that you could skip all cut scenes in the level. It requires a very precise jump from the of the tree branch, towards the beginning of the level and then quickly changing direction, but it allows you to skip the first light wall and consequently jump over the entire level. I will be adding in a video guide shortly to explain exactly what I mean.

Another Equipment Max Star - In order to have a clean Wizard fight you are going to want access to an equipment that maintains your speed while giving you enough armor to tank a hit or two from wizard.