The goal of the game is to collect flags of three different colors by defeating ghosts and going through doors of the same color. Once you have collected three flags of the same color, you can unlock a new ability. The abilities correspond to different types: blue abilities give you movement capabilities, red abilities give you attacking capabilities, and green abilities give you power-ups. You can use these abilities by assigning them to a slot at the bottom of the screen, but you can only use each ability once per room. To get a high score, you need to collect flags of all three colors. Use WASD or the arrow keys to move, or click and swipe to move. You can also click on the "ZZZ" button at the bottom of the screen to wait one turn. Some abilities have keywords, such as "Quick," which allows you to take another turn after using the ability, "Empower," which increases the damage of your next attack by 1, and "Shield," which creates a shield around you that absorbs the next attack you receive and remains active when you switch rooms. Plan your moves carefully and see how far you can go!