Sets of Gaster Blasters appear to shoot beams 4 times:.These bones cover the top and bottom of the Bullet Board and creates a somewhat linear gap between them. The SOUL turns Red, and a wave of bones appear from the left side of the Bullet Board.
A red rectangle indicator appears and bones cover the area. Sans activates Blue Mode and throws the SOUL to the bottom of the Bullet Board.There are three segments for the first attack: Sans always attacks first at the start of the battle. Sans's attack style is focused on platforming, spontaneity, and forcing quick decisions. At the halfway point, Sans also occasionally swaps to Red mode, or uses a mix of Red and Blue. Excluding the first attack, Sans sets the SOUL to Blue mode for the first half of the battle.