Both teams had difficulty balancing themselves since they were not playing on a flat surface.
The ball may roll more than it should with the steep slope on the hill.
The players may even roll down the hill if they lost balance.
It was really hard to kick the ball uphill.
We can see that players lost their balance and fell to the ground.
It was physically more tiring since they had to run uphill to catch the ball.
The players had a fun match.