I’ll cheat because picking just 3 is impossible.
Nethack / Alundra (PS1) / Sim City 2000 / Transport Tycoon Deluxe / Prey / Doom 2016 / Elite / Dwarf Fortress / Rimworld / International Karate / Paradroid
System Shock / Ultima 3-8 / Alpha Centauri / GTA5 / Titanfall 2 / Control / Eye of the Beholder / Sensible Soccer / Star Control 2 / Total Annihilation / Impossible Mission
Undertale / Bioshock Infinite / S.O.M.A. / Nemesis the Warlock (entirely because of the title song) / Pirates! / Stardew Valley / Revenge of the Mutant Camels
This will be an amazing gift to open-source devices. Android has been the elephant in the room, open and free enough and too huge to ignore.
When the elephant goes away, a lot of people will be free to innovate.