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Drop7 is a numbers-based puzzle game where the player drops colored balls, some containing numbers, onto a 7x7 grid. If a ball's number matches the amount of balls in its respective row or column, the ball disappears. The goal is to keep the board from overflowing at the top; after each round additional rows of random balls are dropped onto the grid. The player ideally would set up the balls such that one ball disappearing would place other balls into position to disappear as well, creating a chain reaction.

The game has three modes: Normal, Hardcore, or Sequence. In the Sequence Mode, all players are given the same exact order of numbers each time, with the intent of developing a strategy.

Drop7 started out life as a Flash game called Chain Factor, released as part of an ARG (alternate reality game) for the CBS television program Numb3rs. An episode called "Primacy" (episode 407) revolved around the characters investigating the death of someone involved in an ARG. The episode featured clues that led viewers to the Chain Factor website, which features "error messages" and other such ephemera that unveil the story of a megalomaniacal game developer.

The campaign was considered successful, with the game receiving attention on a number of gaming sites. The game eventually received a face lift and name change, first appearing as a stealth release in the iPhone App store as snap7, then later making an official debut under its current name.


Drop7 iPhone Title screen
Drop7 iPhone The 1 disappears, also breaking the block beneath it.
Drop7 iPhone Starting a new game.

Promo Images

Drop7 Screenshot
Drop7 Screenshot
Drop7 Screenshot
Drop7 Screenshot

Alternate Titles

  • "snap7" -- Working title
  • "7" -- iPhone title

User Reviews

Expect very minimal gameplay, and lots of thinking iPhone Pagen HD (131)

Critic Reviews

Macworld iPhone Apr 16, 2009 5 Stars5 Stars5 Stars5 Stars5 Stars 100
Slide to Play iPhone Aug 05, 2009 4 out of 4 100 (UK) iPhone Jan 30, 2009 9 out of 10 90
IGN iPhone Jan 27, 2009 8.5 out of 10 85
GameSpot iPhone Oct 06, 2009 8.5 out of 10 85
Pocket Gamer UK iPhone Jan 30, 2009 8 out of 10 80
148apps iPhone Mar 19, 2009 4 Stars4 Stars4 Stars4 Stars4 Stars 80


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1001 Video Games

Drop7 appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.

Related Web Sites

  • Drop7 (Download the soundtrack to the game.)
Contributed to by Sciere (502430), Kabushi (196639) and Lampbane (3074)