Shine Block

A Shine Block is a block found in Mario & Luigi: Partners in Time. The block is red with a Shine Sprite and an "M" on it, but it can change (see below).

It is always found near the entrance of a dark room. In each dark room, the babies must go by themselves. The room are totally dark except for some of the bigger platforms. There is always a thin walkway weaving through the room, which serve as protection over the spikes on the room's floor. However, the thin walkways are invisible unless the Shine Block is struck. If the Shine Block is red, Mario should hit it. If it is green and has an L in place of the M, Luigi should. Once the block is hit by the correct brother, a smaller blue block with a Shine Sprite on it will come out and float over to the babies. When struck, this block bathes the dark room in light for a short time, after which the light fades, and the adult Mario Bros. must hit the Shine Block again.

If the wrong brother hits the Shine Block, a Fireball will come out, landing on the babies and forcing them to start the room over. The babies will also start the room over if they fall on the spikes. However, no damage is done for either happenstance.

Trivia
If the player pauses the game as the light is fading, when they return to the game, the light will still be there, albeit dim. This dim light should still be enough for the player to see the walkways, however, so there is no need to constantly supply more light.