Battle City [Model NAM-NBC-4500]

* Taking a grenade power-up will destroy all the enemy tanks on the screen, but is awarded only with 500 points. The automatically destroyed tanks aren't scored on the post-stage screen.

* Reach tank level 4 by taking 3 star power-ups and you'll be able to shoot white armor out.

* The construction stage is disposable.

* Don't enforce a game over by shooting the eagle at stage 36: the game will load the same levels, but with harder enemies. The loop ends after stage 70.

* Watch out for ice: it affects your tank's handling, but enemies don't slide on it.

* Up to 4 enemy tanks can be present at one screen during a single-player game. Double-player game makes even 6 enemy tanks litter the screen.

* Don't shoot your co-player's tank: it'll be frozen for 5 seconds. When an enemy is shooting from behind or any side, you'll not be able to move resulting in a life loss.

* All armored tanks require 4 shots to be taken down.

* When you didn't collect a power-up, it'll disappear when another flashing tank is about to appear on the screen.

* Access secret screen:
At the title screen, select 'construction' on the menu. Press Start on controller #1 to enter the mode, then press it again to return back to the title screen. Repeat this 7 times. After the seventh enter-and-exit sequence, hold d-pad down on controller #1 and press 'A' 8 times on controller #2. Finally, hold d-pad right on controller #1 and press 'B' 12 times on controller #2. After all of this, press Start on controller #1 to activate a secret message from a programmer with a little animation - small drop heading from the top of the screen.