In addition to the similar games listed above, which have been linked to this game specifically in the database, you may find games with a similar theme to Total War in the following lists:
How hard a game is considered to be depends on who is playing it. A three-year-old tackling Zelda will struggle. But equally a new-to-games-parents will find
Mutant Mudds quickly gets beyond them. The games in this list are known for being difficult. They wear the difficulty as a badge of honour. "None shall pass," except this with the will, time and belligerence to get good enough at this particular activity to beat the high bar the game sets.
This might be grappling with the flying mechanics in
Rocket League, getting endlessly lost trying to find the next guardian in
Shadow of the Collosus or coming up with the right tactic to get enough money for the ship you need in
Elite. Of course, some of these games can be made easier, but to play them at their best is to ramp up the difficulty to max (crushing on
The Last Of Us for example) and let them give you all they've got.
These games have an educational element to them, but also offer experiences that are good games in their own right. This isn't busywork to trick you into learning, but clever and innovative ways to encounter history, physics, engineering, maths, geography and language subjects without feeling like you are in school. They also teach softer, deeper skills like long term strategy, planning, balancing systems, emotional intelligence, compassion, team-work and self-care.
Some of these games are aimed at younger players to play on their own, but others (as indicated by their PEGI ratings) are better for teenagers or played together in a family. Find some games that pique your interest, read through the details and decide how your child might benefit from playing them.