Levels become more complex as the player progresses, introducing different mechanics and new types of enemies. Each enemy type is dressed in a unique colour, allowing the player to recognise their movement patterns. Some enemies remain static or rotate on a single node, while others will patrol the board along a specific route.[7] Later stages may require the player to collect keys located on the board and unlock doors that block access to the level objective.[3] Trapdoors connect one location on the board to another and allow the player to move between them during a turn.[6] Some nodes contain potted plants, the player will not be detected while occupying these nodes.[7] Coloured disguises can be found and equipped to let the player walk past an enemy type of that colour without being detected.[6] There are throwable objects that are used to disrupt and change enemy behaviour patterns.[7] Firearms can also be found on certain levels, they are used to shoot targets or obstacles from a distance.[6]