The Snap mechanic is Marvel Snap's most unique feature. Snap when you have a strong hand or a clear win condition. Don't be afraid to Snap early if you feel confident. Conversely, retreat when you have a bad hand, unfavorable locations, or your opponent Snaps and you don't see a path to victory. Losing 1-2 cubes is always better than losing 4-8. Learning when to press your advantage and when to cut your losses is the single most important skill for climbing the ladder.
