What are some good games you can play on a low-end PC or laptop?

Like all the other answers, depends on how low your specs are, but i considered my specs was pretty low which are :

Processor : AMD Athlon 64 X2 3600+ 32 bit

RAM : 3 GB

VGA : ATI Radeon HD 5570

HDD 500 GB

The games i've played are :

WITHOUT TWEAKS

Sims 1–4

Borderlands

Bioshock 1–2

Counter Strike 1.6

Counter Strike Condition Zero

Counter Strike Source

No More Room in Hell

Halo Combat Evolved

Halo 2

Call of Duty 1–3

Call of Duty 4 Modern Warfare

Call of Duty Modern Warfare 2

Call of Duty Modern Warfare 3

Call of Duty Black Ops

Call of Duty Black Ops 2

Call of Duty World at War

Battlefield 2

Battlefield Bad Company

Battlefield 3

Warframe

Dead Island (non definitive)

Dead Island Riptide (non definitive)

Worms 4 3D

Zoo Tycoon 2

Mass Effects Trilogy

Dragon Age 1, 2

Warcraft

Far Cry 1–3

Assassin's Creed 1–2

Metal Slug All Series

TES V Skyrim

TES IV Oblivion

Left 4 Dead 1&2

Dirty Bomb

World of Tanks

War Thunder

The Witcher

Max Payne 3

GTA San Andreas

GTA 4

Microvolts (closed)

Team Fortress 2

Garry's Mod

Half-Life series

Fable 3

Killing Floor 1

Dead Rising

Dead Rising 2 OTR

Fallout 2

Fallout 3

Fallout New Vegas

Resident Evil 4–6

Unreal Tournament 3

Gas Guzzlers

In2ane

WRC 4

Hard Truck Apocalypse

Hard Truck Apocalypse Rise of Clans

Telltale's The Walking Dead Season 1–3

Telltale's Minecraft Story Mode

Minecraft

World of Tanks Blitz

Saints Row The Third

Saints Row 4

Dead Space 1–3

Bulletstorm

Spec Ops The Line

Delta Force Black Hawk Down

Dynasty Warriors 6

Age of Empires 1–3

Age of Mythology

Rise of Nations

Hot Wheels Stunt Track Challenge

Hot Wheels Velocity X

Need For Speed Underground 1–2

Need For Speed Hot Pursuit 2010

Need For Speed Most Wanted 2012

BLUR

Burnout Paradise

FlatOut 2

Ghost Recon Future Soldier

Raft

Terraria

The Forest

Sniper Elite 2

Zombie Army Trilogy

Portal 1&2

This War of Mine

Gear Up

BeamNG.Drive

Spore

Spor Galactic Adventures

Rebel Raiders Operation Night Hawk

WITH TWEAKS

Borderlands 2 & TPS

State of Decay

Bioshock Infinite

Metro Last Light

Metro 2033

Se você tem especificações como as minhas e tem 64 bit você poderia adicionar estas que i'testado com processador diferente que suporta 64 bit com ajustes e esperar alguns lags :

Fallout 4 (Heavily tweaked, with some lags caused by RAM)

Dragon Age Inquisition (w/o tweaks and all low settings, runs pretty smooth mostly 40fps, down to 20 ish on some areas that i forgot)

Watch Dogs (stutters while driving)

Meu anterior AMD Athlon 64 X2 supostamente suportava 64 bit OS mas eu não conseguia't instalá-lo por alguma razão, então lá vai você lista i'já joguei muitas vezes com o meu antigo PC de batata, isto tem sido tão nostálgico, pode voltar a jogar alguns deles