The Zombie Apocalypse


Aim of the challenge

Zombies have taken over the Pi Wars Tower! It is up to you to rid the building of the “differently mortal”.

Shoot all the zombies in the Tower and save the inhabitants. The targets will be at a number of different levels and you must use projectiles as your “anti-zombie device” to knock them over.

Control method

Remote control.

Time limit

5 minutes.


  • Robots will be placed (by the robot’s driver) on a painted wooden surface facing the Tower.
  • Targets will start at floor level and will then rise to several other levels (storeys). The size of the targets is yet to be decided.
  • There will be a ‘boundary line’ in front of the targets beyond which robots are not permitted to go. The distance between this boundary line and the targets is between 1m and 1.5m.
  • There are two possible methods of knocking down the targets. Either one, but not both, can be used:
    • Five balls, each 63mm in diameter and weighing 70g (you can see the ones we’re using on eBay), will be provided in set positions. These can be shunted, nudged or cannoned towards the targets.
      • Once knocked over the boundary line, the balls may not be retrieved until the next round.
      • The boundary line will be a short distance in front of the balls.
    • Your robot can be fitted with its own mechanism capable of firing a maximum of five soft projectiles. We recommend official Nerf darts(Please note: although the standard Nerf holder allows for 6 darts, please ensure that only 5 are loaded!)
      • If using projectiles, the balls will not be set on their spots so you will have free reign to manoeuvre.
      • You can reload between shots, if you wish, but you must not step on the course. Your robot must be driven to your position, reloaded and then sent out again.
  • Please note: If you use the five balls method, you will likely not be able to reach the upper-levels which contain higher-value zombie targets.
  • You can use any method of aiming that you wish, for example a low-powered laser pointer.
  • You will have three full attempts (of 5 balls or projectiles) at this challenge course.  After each attempt, the targets and the balls (if used) will be reset.
  • The stopwatch will be stopped whilst targets and balls are reset. The stopwatch will not be stopped for reloading projectiles however you may choose to reload during the reset of the targets.
  • High-powered lasers must not be used, either for targeting or for knocking the targets down!


  • Points will be scored for each target knocked over.
  • Higher targets will be worth more points, due to difficulty.
  • Targets hit using your own mechanism will be worth more than if you were just using the balls.
  • A ‘good hit’ will count, even if the target is not knocked over. This will be at the discretion of the challenge Judge.

Ask Questions and Discuss

You can discuss this challenge and ask questions on the discussion forum or via Discord chat.