𝐋𝐨𝐰 𝐋𝐞𝐯𝐞𝐥 𝐃𝐞𝐬𝐢𝐠𝐧 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬:

1. Design Parking Lot

• Single Entry and Exit Gates
• Multiple Entry and Exit Gates

2. Design Multiplayer Sudoku Game

• Players have to Rotate the Pin in order to decide the turn.
• Player who is able to fill the last empty cell will win.

3. Design LRU (Static + Dynamic Input Flow)

• Follow Up : Implement LFU with Least Changes in the previous design (LRU)

4. Design In Memory Cache
5. Design Snake and Ladder Game

• How would you change the design if wild cards are allowed.

6. Design Exception Class With Test Cases

• Note: Don't forget to use Singleton Pattern Here.

7. Design Money Splitter
8. Design Notification Service
9. Design Message Queue
10. Design a Terminal/Command Prompt

𝐇𝐢𝐠𝐡 𝐋𝐞𝐯𝐞𝐥 𝐃𝐞𝐬𝐢𝐠𝐧 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬:

1. Design Whatsapp
2. Design Uber Backend
3. Design Tiny URL
4. Design Dream11
5. Design Leetcode
6. Design MS Teams
7. Design Dominos/PizzaHut
8. Design Big Bazaar
9. Design Zomato/Swiggy
10. Design Docker

𝐃𝐒/𝐀𝐋𝐆𝐎 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬:

1. Reverse Vowels in the string.

• Using Constant space

2. Longest Palindromic Substring.
3. Find the largest island in Matrix of 0s and 1s
4. Longest Repeating Subsequence
5. Compress and Uncompress a Tree/Graph/LinkedList
6. All Variations of Jump Game
7. All Variations of Stocks Buy and Sell DP
8. Word Search 1/2
9. Median of 2 sorted arrays
10. Kth largest/smallest element in the rowwise and columnwise sorted Matrix

Note: All the above questions are sorted by their Frequency. 

I hope it will help you in your preparation Journey, All the best for the interviews
Will soon post Repeatedly asked questions from Google,Meta etc

Meta Post: https://leetcode.com/discuss/interview-question/1899352/Repeatedly-Asked-Meta-Onsite-Questions-or-HLD-%2B-DS