Minesweeper, but with Powerups

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This functions like classic Minesweeper, with a few special distinctions:

• Powerups!  If turned on, there's a small chance you will get a powerup token whenever a safe tile is revealed.  This chance increases slightly with more difficult (lower) safe-tile-to-mine-ratio settings.  Powerup tokens can be spent by clicking the icons to the right of the face button when playing, and only if you have enough tokens (shown in parentheses).  Powerups mostly just help uncover spaces for free, which can be a godsend on harder modes, or simply in 50/50 guess situations.  (frustration around guessing in Minesweeper is the reason I started the project!)
• Difficulty is determined by safe-tile-to-mine-ratio, which is a more transparent way to determine difficulty in differently-sized boards.  Note that you can still see the number of mines before playing, and the first 3 difficulties precisely match those seen in classic Minesweeper.
  
• There is a description bar at the bottom of the game at all times to have helpful tips.
• Relax mode: for the extra casual player, a mode with no game overs and no game streaks.
  

If you liked it, have feedback, have a game-winning screenshot you want to share, or found a new bug, please comment below!  Follow if you're interested in my projects and thank you for playing!