There are no theme infobox in some pages. Theme infobox is very important for all level walkthrough pages. This is the theme infobox. Theme infobox is a template that gives you the information about the level. It should be in every levels.
Parameter
Theme infobox has many parameters. You can use this template with this syntax:
{{Theme Infobox
|background=
|bgcolor=
|txtcolor=
|theme=
|image=
|episode=
|lvnumber=
|birds=
|pigs=
|boss=
|miboss=
|tscore=
|difficulty=
|prevtheme=
|nexttheme=
}}
About each parameter
1. background. Fill the color name, R-G-B Equivalent, or Hexadecimal # in this parameter to identify the main background color.
2. bgcolor. Fill like the background parameter to identify the background color for level name and progression box.
3. txtcolor. Like the first two parameter. Identify the text color (level name and progression only).
4. theme. You can identify the text in the level name box. This parameter is not necessary because default of this parameter is the page name.
5. image. See part 3.
6. episode. You have to type the episode name with link such as Poached Eggs or use the photos such as 
and link to the Poached Eggs Episode. You can also use the templates (ABO, ABSpace, and ABSW only) such as {{Original Episode|Poached Eggs}}. It show Template:Original Episode and you can link to Poached Eggs automatically.
7. lvnumber. You must count the level number from level 1. if you create Theme 2-1, you have to key this parameter as 22. Or you create theme 7-7, you must key this parameter as 127.
8. birds. You must use {{Original Birds}} when you edit the original, Seasons, or Rio levels, {{Space Birds}} for Angry Birds Space and {{Star Wars Birds}} for Angry Birds Star Wars. Inserting this template once is adding one bird picture. In these templates, you have to type automatic parameter such as {{Original Birds|Red Bird}} will show 
. You have to key this template several times by order in the game. Example: Birds in level 3-21: 
. You must not type like this: x5 x2. Always bear in mind that different birds in different positions make the level easier or harder.
P.S. About Birds Templates, view source at the template for more information.
9. pigs. Every levels have at least one pig. You have to use {{Pigs}} to express the pigs each level. Typing {{Pigs|Small Pig}} to show Template:Pigs. You have to use this template several times if there are two or more type of pigs. Example: Template:Pigs x2 Template:Pigs x2
P.S. 1. View source at Template:Pigs for more informatiom
2. For Angry Birds Star Wars, use Template:Star Wars Pigs.
10. boss and miboss. When you create walkthroughs for boss levels. Use these parameters instead of pigs. You have to type the boss in boss parameter such as {{Star Wars Pigs|Darth Vader}}--->Template:Star Wars Pigs. About miboss parameter. Use this parameter when the boss levels have minor bosses. Type like the pigs template.
11. tscore. Target score for this level. Most level use three stars system. Use this parameter to type the three stars score. You have to use {{Threestars}} and type the target score at the automatic parameter of Threestars template such as {{Threestars|65,000}}--->Template:Threestars.
12. difficulty. You cannot reference difficulty anywhere. You have to determine by yourself. If you can't, you don't have to use this parameter. It will show "Undetermined: start a discussion relating to difficulty in the talk page!" You can use the talk page to discuss about difficulty until the admins enable article comments. Difficulty levels that you can insert into this template are "Very easy", "Easy", "Considerably easy", "Medium", "Considerably hard", "Hard", "Very hard", and "Insanely hard".
13. prevtheme. Previous Theme. You have to link to the previous level. Example: You make Theme 3-3 walkthrough, you have to link to the previous level by type like this: [[Theme 3-2]]
14. nexttheme. Next Theme. You have to link to the next level. Example: You make Theme 3-3 walkthrough, you have to link to the next level by type like this: [[Theme 3-4]]
P.S. 1.The links should not display the text in parenthesis. You must omit them.
2.I bring the difficulty system from Candy Crush Wiki.
Example
{{Theme Infobox
|background = lightblue
|bgcolor = white
|txtcolor = darkblue
|theme =Arctic Eggspedition 1-18
|image = AE18.jpg
|lvnumber = 18
|episode = [[Arctic Eggspedition]]
|birds = {{Original Birds|Red Bird}}{{Original Birds|Blue Bird}}{{Original Birds|Blue Bird}}{{Original Birds|Red Bird}}
|pigs = {{Pigs|Small Pig}} x2 {{Pigs|Medium Pig}} x2 {{Pigs|Large Pig}} x1 {{Pigs|Corporal Pig}} x1
|difficulty = Medium
|tscore = {{Threestars|96,000}}
|prevtheme = [[Arctic Eggspedition 1-17]]
|nexttheme = [[Arctic Eggspedition 1-19]]}}
Contents
Angry Birds Wiki: Level Walkthroughs Part 1: Guide for Walkthrough Pages
Angry Birds Wiki: Level Walkthroughs Part 2: Level Walkthroughs Contribution
Angry Birds Wiki: Level Walkthroughs Part 3: How to insert the picture in the Theme Infobox template?
Angry Birds Wiki: Level Walkthroughs Part 4: How to use the Theme Infobox template?
Angry Birds Wiki: Level Walkthroughs Part 5: About Difficulty