[ENG only]Ball and niddle. And sth about engine.

[EOG]

Hi I found same topic in german but I do not speak german so can sb translate or some game author would answer.
What are the red rubber(from liblary) ball and niddle(from pub) for?

P.S.
Thx for this game it was pleasure pleaing it.
The Engine test bonus is great. Will you release the engine and documentary for it, so others can use it's great features?