Risk of Rain 2

From the main menu, select Alternate Game Modes, and Prismatic Trials is one of them. This game mode is essentially a rotating weekly challenge of sorts, with a set seed (meaning set levels and bosses and variations). Typically, you need to complete two or three stages to beat the trial. Time doesn't matter, nor doesn't anything else. You just need to beat the stages. The trials are random in terms of which one you'll be doing, but while it's active it'll be the same every time, so you can keep retrying if need be. Some are definitely harder than others, but it's hard to give guidance because I only played one, beat it on my first try, and didn't play any others. I recommend waiting until you've played the main mode quite a few times, so you know what you're doing and have some experience. In Prismatic Trials, everything is unlocked (all characters, all items, etc.). I played as the Engineer like usual, and just built my build like I normally would. I had to finish two stages, and there were set Artifacts active as well. Give the active Prismatic Trial a shot and see how tough it is. You can always come back during the next cycle to see if the next one is easier. With some moderate game experience, completing one of these random trials shouldn't be too bad.