Games like Sid Meier's Covert Action (Classic)
Games like Sid Meier's Covert Action (Classic) include SchoolBoy Runaway, Papers, Please, DAVE THE DIVER, There Is No Game: Wrong Dimension, and Thief Simulator. We matched them by the tags players give Sid Meier's Covert Action (Classic) on Steam (Simulation, Adventure, Espionage, Classic, and Puzzle): closest matches first, and among equally close ones the better-known games.

SchoolBoy Runaway
Shared: Adventure · Simulation · Puzzle

Papers, Please
Shared: Simulation · Pixel Graphics · Puzzle

DAVE THE DIVER
Shared: Adventure · Pixel Graphics · Simulation

There Is No Game: Wrong Dimension
Shared: Adventure · Puzzle · Pixel Graphics

Thief Simulator
Shared: Simulation · Stealth · Adventure

Little Witch in the Woods
Shared: Simulation · Pixel Graphics · Puzzle

The Escapists
Shared: Simulation · Pixel Graphics · Adventure

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Adventure

Little Nightmares II
Shared: Adventure · Puzzle · Stealth

Thimbleweed Park™
Shared: Adventure · Pixel Graphics · Puzzle

MOLE
Shared: Simulation · Adventure · Puzzle

Platform 8
Shared: Adventure · Simulation · Puzzle

Tom Clancy's Splinter Cell®
Shared: Classic · Stealth · Espionage

I Expect You To Die
Shared: Espionage · Puzzle · Simulation

The Rewinder
Shared: Adventure · Puzzle · Pixel Graphics

The Secret of Monkey Island: Special Edition
Shared: Adventure · Classic · Puzzle

Killer Frequency
Shared: Adventure · Simulation · Puzzle

Sid Meier's Colonization (Classic)
Shared: Simulation · Adventure · Classic

Thief Simulator 2
Shared: Simulation · Adventure · Stealth

Chants of Sennaar
Shared: Adventure · Puzzle · Stealth

Death Coming/死神来了
Shared: Adventure · Pixel Graphics · Puzzle

Beat Cop
Shared: Adventure · Simulation · Pixel Graphics

Gunpoint
Shared: Puzzle · Stealth · Pixel Graphics

OneShot
Shared: Pixel Graphics · Puzzle · Adventure