Here's a list of the Steamspy-estimated 'best selling' New Releases for the first 3 months of 2016. I kept the margin of error data because the nature of the thing is fluid and changes. I might add a list later for the best selling not-new games during Q1.
Steam ownership changes between 01.01.2016 and 01.04.2016 for new titles.
Steam ownership changes between 01.01.2016 and 01.04.2016 for new titles.
Code:
1.) Stardew Valley - (793,112 ±21,154)
2.) XCOM 2 - (742,551 ±20,470)
3.) Tom Clancy's The Division - (694,362 ±19,796)
4.) Rise of the Tomb Raider - (655,366 ±19,234) | Max discount: 20% ($47.99)
5.) The Culling - (329,907 ±13,654) | Max discount: 10% ($13.49)
6.) American Truck Simulator - (307,073 ±13,173)
7.) Dragon's Dogma: Dark Arisen - (280,384 ±12,588) | Max discount: 25% ($22.49)
8.) Factorio - (253,695 ±11,975)
9.) Firewatch - (237,088 ±11,577)
10.) Scrap Mechanic - (220,926 ±11,175)
11.) Slime Rancher - (209,806 ±10,891)
12.) Punch Club - (178,817 ±10,055) | Max discount: 30% ($6.99)
13.) SUPERHOT - (165,176 ±9,664) | Max discount: 10% ($22.49)
14.) Far Cry Primal - (143,898 ±9,020) | Max discount: 20% ($47.99)
15.) Street Fighter V - (142,786 ±8,985)
16.) HITMAN - (139,080 ±8,868)
17.) Portal Knights - (108,980 ±7,850) | Max discount: 20% ($11.99)
18.) The Witness - (102,160 ±7,601)
19.) Trinium Wars - (93,411 ±7,268)
20.) Layers of Fear - (88,370 ±7,069)
21.) NARUTO SHIPPUDEN: Ultimate Ninja STORM 4 - (87,036 ±7,016)
22.) FNaF World - (82,812 ±6,780)
23.) Romance of the Three Kingdoms 13 / 三國志13 - (76,953 ±6,597)
24.) Homeworld: Deserts of Kharak - (75,767 ±6,546) | Max discount: 25% ($37.49)
25.) Holodrive - (68,279 ±6,214)