To challenge an opponent on the game board, you need to right beside them e.g. beside or above them. The walkway between you will turn to red and the challenge icon will appear. If you tap it, your Tec and the opposing Tec are brought to the challenge arena. In the area, the 2 Tecs are pitted against each other using their power bars. The challenge occurs automatically once started e.g. the player has not input. So, it is important for players to challenge Tecs that are the same or weaker than theirs so they have a chance of winning.
In the arena, both Tec’s power bards are displayed at the bottom of the screen. Two pointers automatically move randomly along the bars. After a few seconds, they stop. Whoever has the highest attack values wins. If both have the same (and it is not 0), both are knocked off the board. If both have 0 (miss), it is a draw and nothing happens to them.
Every Tec has a power bar. It represents their attack strengths (3 possible) and also the likelihood of that strength being selected. The longer the width of a particular strength, the higher the probability it might be selected. You can check an opponent’s power bar before entering a challenge. As you get more powerful Tecs, they will have stronger power bars. Note a power bar can be affected by spells.
It is a good tactic to use a spell on a Tec before challenging them!