diff --git a/contents/build-front-end-user-interfaces.md b/contents/build-front-end-user-interfaces.md
index 58fd2b144..f0000b0ef 100644
--- a/contents/build-front-end-user-interfaces.md
+++ b/contents/build-front-end-user-interfaces.md
@@ -32,7 +32,7 @@ Companies that ask such questions usually ask candidates to code in one of these
   - Kanban Board
 - Games
   - Tic-tac-toe — [Practice on GreatFrontEnd](https://www.greatfrontend.com/questions/user-interface/tic-tac-toe) (Paid)
-  - Whac-a-mole — [Practice on GreatFrontEnd](https://www.greatfrontend.com/questions/user-interface/whac-a-mole) (Paid)
+  - Whack-a-mole — [Practice on GreatFrontEnd](https://www.greatfrontend.com/questions/user-interface/whack-a-mole) (Paid)
   - Wordle — [Practice on GreatFrontEnd](https://www.greatfrontend.com/questions/user-interface/wordle) (Paid)
   - Tetris (advanced)
   - Snake (advanced)
diff --git a/contents/front-end-system-design-applications.md b/contents/front-end-system-design-applications.md
index 1c585519c..57dc20da1 100644
--- a/contents/front-end-system-design-applications.md
+++ b/contents/front-end-system-design-applications.md
@@ -13,12 +13,14 @@ Front End Interview Handbook is now part of [GreatFrontEnd](https://www.greatfro
 
 ## Examples
 
-- News feed (e.g. Facebook) — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/news-feed-facebook)
-- E-commerce marketplace (e.g. Amazon) — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/e-commerce-amazon) (Paid)
-- Chat application (e.g. Messenger) — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/chat-application-messenger) (Paid)
-- Photo sharing application (e.g. Instagram) — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/photo-sharing-instagram) (Paid)
+- News feed (e.g. Facebook): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/news-feed-facebook)
+- E-commerce marketplace (e.g. Amazon): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/e-commerce-amazon) (Paid)
+- Chat application (e.g. Messenger): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/chat-application-messenger) (Paid)
+- Photo sharing application (e.g. Instagram): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/photo-sharing-instagram) (Paid)
+- Pinterest: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/pinterest) (Paid)
+- Travel booking website (e.g. Airbnb): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/travel-booking-airbnb) (Paid)
 - Video watching website
-- Mail application
+- Email client
 
 ## Framework
 
diff --git a/contents/front-end-system-design-ui-components.md b/contents/front-end-system-design-ui-components.md
index 7085cd2b5..4d9631dc6 100644
--- a/contents/front-end-system-design-ui-components.md
+++ b/contents/front-end-system-design-ui-components.md
@@ -12,10 +12,11 @@ Front End Interview Handbook is now part of [GreatFrontEnd](https://www.greatfro
 
 ## Examples
 
-- Autocomplete — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/autocomplete)
-- Image carousel — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/image-carousel) (Paid)
-- Dropdown menu — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/dropdown-menu) (Paid)
-- Modal dialog — [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/modal-dialog) (Paid)
+- Autocomplete: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/autocomplete)
+- Image carousel: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/image-carousel) (Paid)
+- Dropdown menu: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/dropdown-menu) (Paid)
+- Modal dialog: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/modal-dialog) (Paid)
+- Poll widget: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/poll-widget) (Paid)
 - Selector which loads options over the network
 
 :::info Read front end system design case studies
diff --git a/contents/front-end-system-design.md b/contents/front-end-system-design.md
index 54213ce62..8f3a07274 100644
--- a/contents/front-end-system-design.md
+++ b/contents/front-end-system-design.md
@@ -31,6 +31,8 @@ The two main kinds of front end system design interviews are UI components and a
   - E-commerce marketplace (e.g. Amazon): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/e-commerce-amazon) (Paid)
   - Chat application (e.g. Messenger): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/chat-application-messenger) (Paid)
   - Photo sharing application (e.g. Instagram): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/photo-sharing-instagram) (Paid)
+  - Pinterest: [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/pinterest) (Paid)
+  - Travel booking website (e.g. Airbnb): [Read example solution on GreatFrontEnd](https://www.greatfrontend.com/questions/system-design/travel-booking-airbnb) (Paid)
   - Video watching website
 
 :::info Read front end system design case studies