Bloops

Bloops is essentially a fast “remember your hidden cards, get rid of the expensive ones, mess with your opponents, react quickly, and don't trust your own memory” card game.

For the exact card-by-card rules, setup, every special-card effect, penalties, counter-discard rules, and complete scoring, the official rulebook is the best source because those details can vary by edition. The official Asmodee page provides the rules download.