Develop simple arduino code

BUDGET SLIGHTLY HIGHER:::: I have already started this code and halfway through it however am unsure of how to progress and finish it. The aim of the game is to have : Player gains a point when he presses a button on his side when both LED is on(pins labelled already), When player presses button while only one LED is on he loses the whole game. First player to 5 points will win. LEDs must be variable brightness. Buttons use interrupt service (already implemented). I have added additional files that may also help.