Too many options can lead to confusion, panic, and an eventual blackout where you wake up standing atop a totem pole wondering how you got there. Today's deal narrows down your choices to five of the freshest, seasonally topped pizzas this side of the International Date Line. For $10, you get $20 worth of pizza at Zing! Pizza in Porter Square in Cambridge. There is no limit on the number of Groupons purchased, and you can use up to two per order.