The Low-power Tunnel is a tunnel that features levels which are dimmer, or sometimes completely dark. This is the first level. This level also serves the role of introducing the darkness to the players, so they won't freak out when they discover the threatening darkness in the later levels.
This level serves as an introductory level of the power tiles. Since this is the first level that involves this special feature, so it won't be too hard.
Most of the time in this level you can see the tiles easily, but they may suddenly blink and may become really dark when approaching the end of the level, so be really careful.
Most of the time the level is almost as easy as Level 1 to 3. But since the level consist of 'little' darkness afterwards, so it barely reach the "Not too easy" difficulty.