Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
A.K.A the event where you feel the pain of amassing too many Servants!
https://webview.fate-go.us/iframe/2020/0131_valentine2020/
Compare to last year, this event has a new mechanic: random chocolate-giving. If you don't want to invest your whole week getting every Servant's scene and don't have that many favorite one either, just get a lot of Surprise Chocolates and let fate decides for itself.
Another thing to note is that chocos from last year will stop you from receiving ones this year, so sadly, it's time to use them as materials for your Servants. But only after you have farm enough chocos, cause they give a bonus for the event just like last year. You still keep them in your storage, right? Right?