"t" is not defined in the 3rd level of Arkanoid

[VictorNarov]

Hi,
I get the following warning when playing the level number 3 of the Arkanoid game (gameIdx = 111):
Warning: "t" is not defined in the level mapping.
Which makes it finish after 28 warnings.

I've checked the examples/contphysics/arkanoid.txt and "t" is not defined in LevelMapping although it is used in examples/contphysics/arkanoid_lvl3.txt
LevelMapping
. > background
o > background ball
m > background brick2
n > background brick1
b > background longwall
w > background wall
A > background avatar

Should we replace "t" with some other sprite?