Measuring level of difficulty in game using challenging rate (CR) on 2D Real time Strategy Line Defense game

Real-time Strategy (RTS) games is a game with competitive environment, that can be played by player versus player or non-player character (NPC). Many researcher create intelligent artificial intelligence (AI) to give challenge to the player. But to check if the AI is in the good level of difficulty, some approach needed to calculate the value of difficulty. Challenging rate (CR) formula is a formula that using basic element in RTS games as it's parameter. In this paper a prototype games with proposed level of difficulty was made to try the ability of CR formula to measure value of difficulty. The result is level of difficulty that is proposed can be measured using the CR formula and is on the right state. With CR formula, the comparison for each level of ability can be used to create more level of difficulty, and give data if the level of difficulty is balance enough or not.