Welcome to Octopus Checkers. This is just a regular game of checkers. Nothing out of the ordinary here.
Play it at https://anbnyc.github.io/checkers/.
The objective of the game is to capture all of the opponent's pieces. You win when 12 of your opponent's pieces are in jail.
Typically, pieces must move forward 1 AND laterally 1 space per turn. There are two exceptions.
Pieces capture opponent's pieces by jumping over them diagonally. A piece can move forward 2 and laterally 2 if and only if an opponent's piece in between its origin and destination.
When a piece reaches the opposite end of the board from which it started, it is crowned (purple pieces become blue; orange become red). Crowned pieces can move backwards or forwards.
The game is currently configured for two human players at the same computer, or one human player playing as both sides.
When it's your turn, click one of your pieces. The piece should highlight. Then click the square to which you want the piece to move.
Once your piece is highlighted, hold down Shift to select multiple tiles to jump over/capture multiple opponents. Your move will begin when you release Shift. (If it doesn't, your move was not allowed.)