48. Strikers 1945 II (1997)
Dropping from 47th, I sunk more quarters into this game than I could keep track of. The game is a very enjoyable vertically scrolling bullet hell game based on a fantasy take on World War 2 where the enemy has giant mechs in addition to the usual tanks and planes. The choice of different planes allowed for different defensive skills which added variety to the strategy (my favorite was definitely the flying pancacke. Additionally, the randomization of the level order kept you from getting stuck on one particular area each game. This isn't the hardest game in the bullet hell genre by any means, but the more accessible difficulty and my experience getting to play it in an arcade instead of with a console controller lets it edge out brethren like Touhou. Chasing high scores with friends could eat up the better part of an afternoon playing just this game.
Primarily an RPG player but have interest in any game that will make me think.