Get the achievement "MERCURY PROBE" with NASA Agency before 1963
Get the flyby of Mercury with NASA before 1963 (with Mariner 10 probe)
Won the best date.
In case of ties, win who first indicates the best date.
The challenges are posted on the Slitherine forums, Steam forums, Punta de Lanza forums and Twitter.
Remember that you will be immortalized in the Hall of Fame.
