Head Ball 2 always tries to find an equal opponent for you. To do this the system first checks your account level and your average success in Head Ball 2. As a result of these parameters, it will pair you with the most suitable opponent.
At the beginning, your opponents can be up to 3 levels higher than you but this limit increases as you level up. For example, if you are level 35, it will look for the players in the +/- 5 level range. In this case, your opponent will be a player between 30 and 40.
Level 1-19: +-3
Level 20-45: +-5
Above level 45: no level limit
If you are constantly winning your matches, you are likely to be matched with an opponent that is stronger or equivalent to your strength. If the system cannot pair you with a real player, you will be paired with a bot that meets your criteria.
You can defeat tough opponents by upgrading your characters, using superpowers, or even better accessories.