Its a 2 player game. Both players can sync with each other. They can move around (physically, by moving themselves around). They can move their phone and accordingly what they are seeing on the screen will change. Player 1 is a cannon. And player 2 is a sniper. There is a radiated dome/castle placed somewhere (something like this [url removed, login to view]). Its radiated so no player can go near the dome or they die. Cannon has to destroy the dome by shooting cannon balls. The sniper has to shoot cannon balls and explode them in mid air so as to protect the dome. The sniper will also have to shoot the cannon to deplete his health (player 2 will shoot player 1). Cannon's health will deplete 0.01% with sniper's each bullet. There is atleast 1 second of gap between each cannon shot. There is 0.1 second of gap between sniper's each shot. The dome's health will deplete 1% with each strike of cannon ball. Sniper's bullet will not take any time to hit the target. Cannon ball will make a parabolic trajectory to hit the target. The dome should be placed approximately 1000 ft away from each player. The players cannot go within 600 ft range of the dome. Whoever goes in that area first, dies and looses. Cannon ball can increase or decrease the velocity of the cannon ball shot in the range of 100ft/sec to 5000 ft/sec. The gravity should be 34 ft/sec. Also, in the player 1's screen, a dotted parabolic trajectory should always be displayed according to his current settings and direction. If the trajectory hits the dome, the dome should be greenish on the player 1's phone, otherwise reddish.
When the game is over, the players might or might not exchange their roles.
Graphics could be crude, but they should decent enough to be presented to people.