1. If you search for “solitaire,” you can play a round of the classic card game.
2. Searching “tic tac toe” will let you start up that game. You can set it to play against a friend or Google itself. For a real challenge, set the difficulty to “Impossible,” and try to get anything done at work.
3. If you're in the holiday spirit, you can play a digital game of dreidel by searching "spin (or play) dreidel."
4. If you have a tough decision on your hands, Googling “flip a coin” might help.
5. Or, try “roll a die.”
6. Searching “askew” will turn the page slightly...askew.
7. Searching “anagram” will ask if you meant “nag a ram." That, of course, is an anagram of "anagram."
8. If you know anything about programming, you'll get a kick out of this one: searching for “recursion” — a programming term referring to a function that calls back to itself — will ask if you meant “recursion.” Now try clicking on it repeatedly. Get it?
9. Search “what sound does a dog make” and you'll get a "woof" sound — you can also try cow, pig, duck, and a few other animals.
10. This one is for "Seinfeld" fans: When you type in "Festivus," you'll see a pole pop up on the left side of the screen.
11. If you’re feeling curious, search “fun facts” (or “I’m feeling curious”). That’ll return a Snapple-cap-style piece of random information, which you can refresh right on the page.
12. Searching “Google in 1998” will bring you to a page reminiscent of what Google looked like a couple decades ago, complete with company background info — and that awful logo.
13. Searching for “the answer to life, the universe, and everything” brings up a calculator result of 42, a reference to Douglas Adams’ “The Hitchhiker’s Guide to the Galaxy.”
14.  A treat for those who remember Nintendo’s "Star Fox 64": Searching “do a barrel roll” will spin the results page a full 360 degrees. You can also search “Z or R twice” — that's the command you had to hit on the Nintendo 64 controller to do said barrel roll.
15. Googling “Pacman” will allow you to play the interactive game Google created for a Doodle celebrating the little yellow guy’s 30th anniversary back in 2010.
16. Move over to Google Image Search, and searching “Atari breakout” will turn that page’s images into a big game of — you guessed it — "Breakout."
17. If you're still not over the fidget spinner craze of 2017, try searching for "spinner." You can chose between an endlessly spinning fidget spinner or a "Wheel of Fortune"-style number spinner.
18. Google added a tool for musicians, too. Just type in "metronome," then adjust the BPM for your piece of music.
19. If you search "Is Google down" you'll get a concise "no."
20. Here's my personal favorite: turn off your WiFi and open a new Google Search. You'll get a screen that says "There is no internet connection" below a little dinosaur. But tap the space bar, and the page turns into a tiny game where the dino has to run and jump over cacti.
21. BONUS: This trick doesn't work on the desktop version, but it works on mobile. Type in "bubble level" and it will turn your phone into an actual working level. So long, crooked picture frames!

Main Source:

http://www.businessinsider.com/google-search-easter-eggs-2018-1?utm_content=buffera3ff8&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer-ti&IR=T/#26-bonus-this-trick-doesnt-work-on-the-desktop-version-but-it-works-on-mobile-type-in-bubble-level-and-it-will-turn-your-phone-into-an-actual-working-level-so-long-crooked-picture-frames-26

• Microsoft Internet Explorer
• Mozilla Firefox
• Google Chrome
• Opera

• Open Internet Explorer
• Click Tools (press the Alt key if you don't see the Tools menu option)
• Click Options (or Internet options)
• Click the Privacy tab

• Open Mozilla Firefox
• Click the Tools menu option.
• Click Options
• Click on the Content option in the Options window

• In the URL field, type about:config and press enter.
• This should open the Firefox config window.
• Right-click on a black portion of the window and click New and then Integer.
• For the preference name, type privacy.popups.disable_from_plugins and click OK.
• For the value, type 2.

• Open Google Chrome
• At the far right, inline with the address bar, click the Menu icon  (titled "Customize and control Google Chrome").
• Select Settings
• At the bottom of the Settings page, click Show advanced settings
• In the Privacy section, click the Content settings button.
• In the Content settings window, scroll down to the Pop-ups section. If not already selected by default, select the "Do no allow any site to show pop-ups" option. You can also add sites to the exceptions list to allow pop-ups from those sites by clicking the Manage exceptions button.
• Another option for Google Chrome users is to download and install the Ad Block Plus extension for Chrome. This extension will block most pop-up ads from opening in Chrome

• Open Opera
• Click the Opera button in the top left corner
• Click Settings
• Click Quick Preferences
• Within the Quick Preferences menu, you can choose "Block unwanted pop-ups" or "Block all pop-ups."