The best replacement for flappy bird is splashy fish.

The best alternatives to flappy bird are rated as following:
★★★★★  splashy fish
★★★★  mario
★★★  flappy wings
★★★  chuck norris
★★★  angry birds
★★★  clumsy bird
★★  flappy bird
★★  ironpants
★★  candy crush
★★  nintendo
★  super mario
★  helicopter
★  tiny wings
★  mario bros
★  angry bird
★  flappy fish
  temple run

Your alternative for flappy bird is not listed? Suggest!
Speaking about flappy bird, one probably shouldn't forget about phone.

Other search terms related to flappy bird and their ratings are:

★★★★★ phone
★★★★★ iphone
★★★★ smartphone
★★ app store
★★ cheats
You have in mind a companion for flappy bird and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of flappy bird in all years. Click on graph for more.
flappy bird
splashy fish