Beginner's guide

Starting Out/Rerolling
While rerolling is not necessary, it is recommended as it will help in the long run. But if you're gonna reroll, you should be aware that if you reroll in non-event periods, you'll only have one 10 roll, meaning it'll take quite a lot of tries for you to get the unit you want.

If you want a guide on how to reroll and what to reroll for, check out Rerolling

Progression
Now the first thing you want to work towards in World Flipper is finishing the story. Finishing the story gives you access to co-op bosses which is what you're going to be farming a majority of the time, thanks to the fact that they cost 0 stamina if joining a bell.

Afterwards, the thing you're going to be planning towards is The Kaleidoscope and Necropolis. The Kaleidoscope gives you elemental materials needed to raise your character, from tier 1 to tier 4. The chance to obtain tier 4 material on kaleidoscope element level 50 are 30%. While Necropolis gives you random tier 1 material to tier 4, Armaments and Dreamer's Crests.

After you're done with that, you're going to want to farm for every boss unit and armament as they're commonly used, the prime examples being Murakumo and Ame no Habakiri.

After you've farmed these things, it's time to move on to the harder difficulties of bosses, notably the Godly difficulty. These bosses are harder to defeat when not using a team specifically geared towards beating them so it'll require you to make a new team, which is where your materials will come in handy.

If you're struggling with things like building teams or just have any questions, feel free to ask around the Reddit and Discord or check the FAQ section.