Test your levels as all forms of Mario (small, super, fire, cape). If it's possible to enter a level with Yoshi, make sure to test that as well.
用所有状态的马里奥测试关卡（小玛丽奥，大马里奥，火球，斗篷）。如果带要吸进关要吸也要检查

Licking your elbow is almost（这个单词是斜体） impossible. However, successfully completing this task allows you to teleport anywhere in the world.
舔到你自己的手肘是几乎（斜体）不可能的。但是如果你做到了你就是lv4空间移动hentai

If you place too many sprites on the same screen, it will slow the game down and cause frustration to the player.
一个屏幕里的精灵放得太多会把游戏拖慢，让人玩着很不带劲

Fix any errors you see before releasing any demos; "I'll fix it later" isn't a good excuse.
在放出demo前修复所有你看见的问题；“我以后会弄好的啦”是很怠惰的理由

Make a backup of your hack before using any external tools on it.
每次要再用一个其他的工具前做个备份

Keep your graphics within a specific style. Don't mix cartoony sprites with detailed and realistic back/foregrounds!
保持GFX的风格统一。不要把卡通系和写实系的混起来

ExAnimation also works on sprites!
ExAnimation对精灵也有效！

Don't use glitched graphics.
不要用出问题的图像（当然故意的除外）

The Chicken came first.
先有鸡再有蛋

Avoid blind jumps. If the player has to jump down a random hole to proceed with no indication at all that they can go down there, you've done something wrong!
避免信仰之跃。如果玩家跳坑时没有“可以跳”的指示的话就是你的不对了

Don't put levels in overworlds that don't match (like a snowy level in a desert).
不要搞出和ow不相符的关卡（冰雪关却是沙漠ow这样的）

Don't put a coin over a question block. It will create an invisible solid block above the ? block if the block is hit first.
不要在问号砖顶上放金币。这样的话顶过问号砖之后金币就会变成隐形固态平台（这是老bug大家知道）

Press Ctrl+Del to delete original levels before making a new level.
在做新关卡前按Ctrl+Del来删掉原来的关卡

Try to make a hack that is both hard enough to be challenging and easy enough to be fun.
要做就做难能难得让人想去试简单能简单得有趣的改版