Split the class into 3 teams. Each team has a Ki. Begin by passing the ball amongst team members to tag as many Pou as possible. Players are not allowed to move with the Ki. Every Pou which is tagged equals one point to that team. 

Once the players understand this aspect, introduce one Taniwha for each team. The Taniwha stands in Te Roto zone, and is not able to move with the Ki. Teams now bank their points by passing to their Taniwha, who throws the Ki at the Tupu. If the Ki hits the Tupu, then the points are banked. Add a rule that points will reset (excluding points in the bank) if the Ki hits the ground, to encourage banking the points at appropriate times.