collectathon

From collect +‎ -athon.

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collectathon (plural collectathons)

1. (video games, informal) Synonym of collect-'em-up
   • 2015, Rich Stanton, A Brief History Of Video Games: From Atari to Virtual Reality, page 202:

     Rare would go on to produce several 3D platformers in this mould: Donkey Kong 64 (1999) was an absolute collectathon notable for an appalling opening rap and the ability to play as five very different characters […]

   • 2016, Gamer Guides, Pokémon Sun & Moon - Strategy Guide:

     As if this wasn't already becoming one of the most tedious collectathons ever, the game only bothers to track the total number of Zygarde Cells and Cores you've collected, which you can check by using the Zygarde Cube item from your bag.