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).
  • Targets will be located no higher than 60cm above ground level.
  • The targets will be no smaller than a standard playing card – 62mm wide by 88mm length (2.45 inches by 3.5 inches).
  • 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!
  • Although it is preferable to knock a target over, any hit on a target will count. This is to ensure fair play.


  • 20 points will be awarded for each target in the “compound”.
  • 35 points will be awarded for each ground floor target.
  • 40 points will be awarded for each middle floor target.
  • 60 points will be award for each top floor target.
  • An additional 140 points will be awarded if all 5 shots hit their target, regardless of which floor the target is on.
  • 200 points will be awarded to robots that provide their own firing mechanism and do not use the balls provided.


  • 20 points will be deducted, and no points scored for that role/shot, if your robot should cross the foul line marked on the floor of the course.

Ask Questions and Discuss

There are a number of ways you can discuss this challenge and the competition in general.