A compiled manual for all of the games built into the Intellivision Flashback was generated by Mark Thompson.
Media Links:
media0101.intvprime.com/ba4ef/intellivision-echo/Game-Physical-Materials/Group-10/Intellivision-Flashback-Manual-all-in-One.pdf
Source Links:
atariage.com/forums/topic/230208-intellivision-flashback-all-in-one-game-manual/