Hidden Test Mode

[Samtastic]

I have a game from Torx from Hasbro and I have been struggling to find the hidden sampling mode which gives me access to all the sounds. Every Bop it game I have has one and every game from Tiger Electronics including Brain Warp, Brain Shift and Boogie Ball has one. Basically a test mode is a mode where if you press a combination off buttons down at once and reset the power, the game goes into a special program and it plays through a sample of sounds.

Here's what the toy looks like. I notice one of the twisters doesn't move. Only one of them is twistable and the two benders move. There is a power switch on the top that turns the game on and off.
http://d2ydh70d4b5xgv.cloudfront.net/images/0/b/torx-handheld-electronic-brain-teaser-mind-twisting-talking-bop-it-style-hasbro-7dac5f7d1179170082ec0f286abe6ec1.jpg

Any idea on what mods could be done to allow it to enter it's sampling mode?