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UFO - Game of Close Encounters (Avalon Hill, 1976)

Has the original counters, basic and advanced game, and some flashier 3d models if you want to get a little zany.

After having played this with my kids, and a few adult friends, we've unanimously agreed the basic rules are way more enjoyable, and there's plenty of depth in those simple mechanics. The advanced game just bogs everything down. But it's all here, enjoy.

From BGG

UFO is a low complexity abstract game themed on an alien invasion of Earth. The alien player must land 5 of 8 available ships on Earth to win. The Earth player, with only eight rockets, must defend or perish. Movement is along orbital paths that form 7 concentric rings around the Earth. Each player rolls two dice and moves one rocket or UFO the exact count of for each die. In addition to the UFOs and Earth's rockets speeding around, the moon orbits the Earth destroying all in its path. Combat is not dice based, rather players capture opponents pieces by landing on them by exact orbital move of one die.

The advanced game adds dummy counters for the alien player and space stations for additional defense of Earth.