In player order, players take turns choosing an obstacle and placing it into the play area until all obstacles have been placed. Set all devices aside.

• Obstacles must be placed beyond range 1 of each other obstacle and beyond range 2 of each edge of the play area.

During the End Phase of each odd-numbered round, the first player places one set-aside device into the play area. During the End Phase of each even-numbered round, the second player places one set-aside device into the play area and places 1 fuse marker on that device.

• Devices must be placed at range 1 of an obstacle and beyond range 0 of each other object.