Three scenes have been found.
From The Lost Media Wiki
< Alphablocks (partially found web-exclusive scenes of CBeebies animated series episodes; 2010-2013)
I have discovered that playthroughs of the flash game exist online through the website "Dailymotion".
Through this and with some help, I have found the scenes "spot" and "tops" from the Bus episode, and "dug" from the Up episode.