This is level 3 of the L-Tunnel.
The Runner can use small jumps to go over small gaps has high maneuverability. She can also go over one-tile gaps without jumping, so there is room for error. The big gaps can be jumped by the Runner, so she is the optimal choice.
Some of you may want to use the Lizard. You can do this, but be careful of overshooting. If you want to change gravity with it, it is highly recommended to do a high jump and touch the wall, since this can reduce the possibility of being too focused on the gravity-changing process and ignored the holes and gaps next to you. Also, be careful that you don't change gravity too late and ended up landing in a gap while changing gravity!