During the first round, one additional goal is to collect weapon boxes and energy towers. Before round two starts, players get the opportunity to upgrade their robots with the collected weapons and energy (the latter goes into the abilities). It is important to note that the screen is always split in two, even in single-player, and that the playfield has different planes. However, it hangs in the air and allows robots to fall down at the edge - it comes back up, but in this time the opponent has an advantage.
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