Since the demise of Nick GaS, the series is no longer being rerun. Moreover, GaS only had around 60% of the 195 episode run in its rota, including about 10 episodes from the 1987 season with Harvey, although another 12-14 episodes from that period are known to be on the trading circuit.
The two celebrity weeks from the Toffler series were never shown on Nick GaS, although at least one episode from each week is known to be on the trading circuit (including an episode from the Josie Davis/Emily Schulman week which finished as a tie; Josie and Emily ran the Romp together, with any prizes won going to both of their teammates).
Also counts for the UK version - the first two series were made by TVS (the ITV company for the South of England which produced and networked the show) whose archive ended up in rights hell after the paperwork went missingnote It began when TVS decided to purchase MTM Enterprises (the creators of The Mary Tyler Moore Show, WKRP in Cincinnati, and others), and got heavily into debt, and as a result lost their broadcasting rights to Meridian, and it was then sold to International Family Entertainment, the holding company for what is now Freeform, spun off from Pat Robertson's CBN organization. When Fox Kids acquired what then became Fox Family, MTM came along, and when that got sold to Disney, MTM's library had already been absorbed into Fox. Throughout all these legal shenanigans, TVS' library got lost in the shuffle. and may well never be seen again (the early years of Catchphrase have also been hit by this). However the later series were made by Scottish Television, and Series 3 and 4 were repeated on Challenge starting in 2014.