A Guide On How I Get 4 Vault Keys On Every Portal (Sonic Frontiers)
Here's the terrible guide on how I get all the valut keys from every portal stage.
*I have completed the game but I have only played on Normal difficulty*
First: play the stage and get all the red coins, take as long as you need. Time doesn't matter on this step.
Next: you will play the stage a second time (keep in mind on how much time you need for a S rank) This time you don't have to worry about red coins, just go as fast as you can.
Retry any time you mess up, this is the hardest part.
Optional step: before you do the S rank run, You can play the stage and find every way to beat the stage. Then just do the route you found best.