The mobile version of videogame franchise "Call of Duty" racked up 100 million downloads in its first week, industry site Sensor Tower said on Tuesday, dwarfing the debuts of previous smashes including "Fortnite" and "PlayerUnknown's Battlegrounds" (PUBG).

"This is by far the largest mobile game launch in history in terms of the player base that's been built in the first week," said Randy Nelson, Head of Mobile Insights at Sensor Tower.

The first-person shooter hit's publisher Activision Blizzard Inc launched Call of Duty: Mobile on Oct. 1. Sensor Tower said the numbers reflected worldwide unique downloads across Apple's App Store and Google Play in the period since.

PUBG, Fortnite and Electronic Arts' Apex Legends respectively scored 26.3 million, 22.5 million and 25 million in their first week of release.

(Reporting by Neha Malara in Bengaluru; editing by Patrick Graham) ((Neha.Malara@thomsonreuters.com; within U.S.+1 646 223 8780; outside U.S. +91 80 6749 0344;))