The best online casino welcome bonus offers have exciting reward potentials and reasonable terms and conditions. They include 100%+ Deposit Match: This sign-up bonus gives you over 100% return on your first deposits. Suppose you add $50; a 150% match bonus gets you free $75. And Free Spins: These are chances to spin slot machine slots for free. The best of these offers are received on Mega Moolah slots due to the winning possibilities.