I used this activity specifically for 5th Grade Unit 1 Review (Blue Sky Textbook). However, this can be used for any class that is learning school subjects as well as capital and lowercase letters.
I only have 27 questions on there at the moment, so let me know if I should add any more.
Link: https://dashboard.blooket.com/set/6631984a350e9bc8ce193b0e
Update: The 5th Grade class loved it. The school system blocked the student tablets from using Blooket, so we used two teacher tablets and split the class into two teams. We completed the pirate chest game version, and they loved it. You will most likely have to use the time limit option rather than amount of gold because after about 20 mins of play time (They were super invested even though they had already gone through the questions), the teams each ended up with about 500 gold, and they highest they had at one time was 15,000. They celebrated over the small wins and worked out how to take turns without us even having to tell them to.