Games like Blocksplode
Games like Blocksplode include Poly Bridge, Garry's Mod, Poly Bridge 2, Besiege, and Totally Accurate Battle Simulator. We matched them by the tags players give Blocksplode on Steam (Puzzle, Simulation, Sandbox, Physics, and Building): closest matches first, and among equally close ones the better-known games.

Poly Bridge
Shared: Simulation · Puzzle · Physics

Garry's Mod
Shared: Sandbox · Physics · Building

Poly Bridge 2
Shared: Puzzle · Simulation · Physics

Besiege
Shared: Simulation · Sandbox · Physics

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Physics

Bridge Constructor Portal
Shared: Puzzle · Simulation · Physics

Human Fall Flat
Shared: Puzzle · Physics · Sandbox

Brick Rigs
Shared: Sandbox · Building · Physics

People Playground
Shared: Sandbox · Physics · Simulation

Goat Simulator
Shared: Simulation · Sandbox · Physics

Poly Bridge 3
Shared: Puzzle · Simulation · Physics

Kerbal Space Program
Shared: Simulation · Sandbox · Physics

Crazy Machines 3
Shared: Puzzle · Simulation · Physics

Space Engineers
Shared: Sandbox · Simulation · Building

Fun with Ragdolls: The Game
Shared: Sandbox · Simulation · Physics

Tricky Towers
Shared: Puzzle · Physics · Building

Planet Coaster
Shared: Simulation · Sandbox · Building

Two Point Hospital
Shared: Simulation · Building · Sandbox

Kerbal Space Program 2
Shared: Sandbox · Physics · Building

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Hozy
Shared: Puzzle · Sandbox · Simulation

Surgeon Simulator
Shared: Simulation · Physics · Funny

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Physics · Building

The Sims™ 3
Shared: Simulation · Sandbox · Building